Archimedes:
I doubt that the Taleban's IT kit allows access to that sort of thing (instant execution, I'd imagine, for being found on that site).
I think this is an unsupported and very dangerous assumption that has not been born out by facts at all, at least in the case of Al Qaeeda.
I therefore suggest that any further speculation as to his past, present or future activities by half knowledgeable people, and I mean ANY, is highly unwise. Zip lip.