I think the problem is it may be the ENGLISH LANGUAGE that presents a difficult understanding for you.
How can you even attempt to talk about language/linguistics when you fail at
basic comprehension? The irony makes me chuckle.
Literally, you have brought exactly what I said, but have interpreted it very wrongly engaging in a very apparent
illogical fallacy called
"non-sequitur."
Non-sequitor basically means the PREMISE of what you are saying is true, but your CONCLUSION is absolutely false.
Since you are deeply emotionally invested in reaching this false conclusion, how about we use Lamberti's;
1. MAPs to gauge what Lamberti meant by "Northern Somali" as a general term to explain who the standard Somali is attributed to
Yes, Lamberti did say "Northern Somali" supplied the official language of the Somali Republic, but his classification of "Northern Somali" for that point is the COMMON SOMALI tongue that is spoken in Garbahaaray as it is in Boosaaso as it is in Hargeisa;
Here is his map to show what he meant by Northen Somali
See where Lamberti put NordSomali in Garbahaaray? I don't see any Isaaq there.
2. As if his MAP wasn't enough to show you he DID NOT MEAN ISAAQ when he said "Northern Somali" was the base of the Somali language standard, Lamberti actually EXPLAINED HIMSELF in his first and most exhaustive book.
His 200+ page German-language chief scholarly book on the subject titled Die Somali-Dialekte from 1983 (what you posted is a smal English language primer of his 1983 book prepared for the 1986 Somali Language Conference)
In Page 31 of Die Somali-Dialekte which was the seminal work of Lamberti
To further spread these dialects in recent years, the choice of dialect of Mudug has contributed to the national language of the Democratic Republic of Somalia. It is this Daarood dialect that is the source of publications in the Somali language, be it textbooks or literary works. Also, the use of a koiné of these dialects as means of communication of mass media (radio and magazines, etc.) as well as of school operations has led each Somali to understand and speak these dialects, as well as a second mother tongue, even if his own Dialect belongs to another group. The dialects of this group are also the best studied to date and their interest in them has increased even more since they set the national language of the country. Many publications have appeared, especially on Is. In the study of this dialect,
3. It's embarrassing how your entire position was built on bad comprehension of phraseology LITERALLY only relevant to direction. .
Lamberti called the Common Somali tongue "Northern Somali" because everything north of Beled-Weyne came under it in comparison to Af Maay and Af Banaadiir who occupied south-central.
So when he said "Northern Somali" was the base of standard Somali the word "northern" made you guys perk up.
Then when differentiating Northern Somali, he called the actually northern most region "proper North" (as in directionally proper) like how everything west of the Mississippi is the West to US East Coast but the 3 States of Oregon, Washington, and California are the proper West Coast.
It's literally bad comprehension and desperate intent because Lamberti HIMSELF explained just WHICH GROUP of "Northern Somali" he had in mind when he said that overall dialect is the base of standard Somali.
4. Why do you guys always come up with the ridiculous Gogo xaar.
Somali is a TONAL language. The entire gender/pitch/meaning/sound of a word changes based on tone.
Gogol xaar is not the same as "xaar". I literally pronounce them differently.
When saying Gogol "xaar," my tongue is literally stiff and flares at the wings near my molars. Also my tongue makes an indentation near the tip.
When saying the bathroom "xaar" my tongue is lazy and loose. 0 stress or stiffness.
Tone has many important uses in Somalia. For example it also makes gender sometimes. Look at the wors "inan"
I-nan with initial stressed tongue means boy
In-an with a very lazy and loose tongue means girl
5. No comment about what colonial writer said about any tribe bruhaha. How impressionable are you?
I can't count how many colonial writings I have read and the truth is it's the first tribe that gets to them that is their perspective on the people.
I have come across Marehan saying they don't give their girls to the Hawiye because they blow up the ass of their cows. Why would I need to bring that to anyone knowing ridiculous tribal prejudice was expressed?
6. Finally, please let this be a lesson to you. You guys have posted that embarrassing concoction literally everywhere when the Lamberti preempted you and explained exactly what he meant.
Next time do better research before embarrassing yourself.
. 
