I don’t know the truth of the matter and Seymour could be right. We just can’t tell from the evidence provided.
It's long but after reading this ask why you would believe this man who, in this new article, is making plenty of assertions all based on quotes from a single anonymous source.
https://www.vox.com/2015/5/11/8584473/seymour-hersh-osama-bi...
If someone had an inside source on deep background with evidence of an American cover-up? Hell yes they would. And if they wouldn't, the Journal would pay a premium.