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Wouldn't it just be written off as a conspiracy theory that provides little to no evidence for its claims?
If the only thing that gets this on HN is Seymour Hersh's reputation (which has lately become somewhat questionable) then you might want to reconsider. Plus, the quality of the comments has not been very good so far.
This is an actual case of speaking truth to power. He clearly (and rightfully IMO) does not trust the US government and his "somewhat questionable" and recent work has continued that trend. Is it any surprise that the same institutions/people that continuously carry water for the government now rush to label him a conspiracy theorist?
It is not gatekeeping to demand that extraordinary claims are backed up by evidence.
And there is an absence of evidence here.
Nope. The normal flagging rules are a sperate threshold.