Hmmmm...search warrant applied for looking into “instructional manuals for acts of destruction and acts of terror” Found some tools and some books and some writings and some graph paper. Strangely (not) no “violent video games played under the name Ismail Ax” are mentioned.
The gamer name would have been used online. That wouldn’t come out until his computer was searched.
It is a viable possibility, just as viable as Ismail Ax being a jihadi name.
Why exclude either option at this early date?