Its a work written in 1200s and copied in the 1300s.
It's hard to ascertain what an author and copiest ethnic/national origins are on manuscripts in Harar because they wont use a Nisba as they are local. It could be a Somali seeing the date of it , harar didn't exist at time this was copied and how at that time Somalis were known has hanafi jurispridence scholars. We know that some of the antique manuscript collections when Burton visited was in the private hands of Somalis as well, so it's a possibility.
It also goes to prove what i said before that Harar was a central collection place for binding and preserving manuscripts.
But nonetheless this is an important find , this is connected to the regions scholarly history.