User blog comment:ArrowFan456/The Flash: Season Zero canonicity/@comment-26014635-20160228014920/@comment-26412696-20160228220446

Yeah, it's hard to say what is and isn't canon, especially without confirmation from the writers. We can't discount all of the Arrow comics, either, since Talibah has since appeared in the show after debuting in the comics (which, admittedly, was a very nice nod).