I thought this was pretty much considered to be a myth by anyone who has actually looked into the issue.
Nope it's something that was lauded all the time back when Osama was considered a good guy and friend to the USA. I't pretty much common knowledge that the USA funded/armed the Islamic fundamentalists in Afghan, hell Rambo and James Bond even fought along side them in 80's movies (after Rambo's commander was captured while delivering weapons to them)
Here's a nice US article on Osama lol:

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