And this is based on what exactly, besides wishful thinking?
One does not need to have won a Nobel Prize to blow oneself up.
If it was a lone suicide then why where TWO devices found? I wouldn't trust anything the authorities in Oklahoma say.
It is nothing but wishful thikning. Lots of people wanted it to be an Islamic terrorist attack.
That's based on the reported explosive power of this bomb. No, it doesn't take a Nobel prize but it takes some expertise, design work, and the explosives. And to get something to work so effectively on the first try, usually it takes some live testing. He may not have been able to do that, in which case this would have been his live test ( and it worked.)