Not much new in that article that wasn't known like Abdillahi Yusuf arrest in 1986 and only released when Menguistu fell to the TPLF, who were housed and trained in Mogadishu.
Ethiopia and it's planned annexation of Galdogob and Balanbale was the final straw that ended the SSDF rebellion but what people don't know tensions were building up way before all that as Abdillahi Yusuf wanted a dual war front with SSDF and SNM, he also wanted a Post Siyad Barre Somalia settlement between rebel groups before removing siyad so a vacuum doesn't occur. But he saw they werent doing that and had different plans for SNM which we all found out later as fact anyways and a vacuum for Somalia.
I suspect it was Menguistu failing to do this is when Abdillahi saw the writing on the wall but annexing Balanbale and galdogob was the final straw, their were many preceding contentious issues unresolved.
He also thinks we don't know habasha are hanash(deadly snakes) even stated by ancient arabs proverbs, we know they like to play bait n switch shit while acting all friendly. They are masters of shirqool that culture and I think Abdullahi knew it.