Why all the quotes? It makes your response seem either sarcastic or disbelieving, either way a bit disrespectful.
On HN the usual way to quote is like I have done above.
I too react like the poster above you and would probably not quote that way except to ridicule. Hopefully there aren't many of these across my posts.
(As for an almost green account commenting on HN standards I have been here is some form or another since around 2009 I think, I just once in a while create a new account so it won't be trivially simple to doxx me.)
Extraordinary claims require extraordinary evidence.
Edit:
By the way, what do you mean by threat level here? And FWIW, here I could have used quotes without being rude.
Also: if you read that sentence again you'll probably find that it wasn't just the use of quotes but the sentence that as a whole that made it stand out as rude.
Suggesting it is an extraordinary claim, and would suggest an extraordinary threat to all AWS accounts. This seems very unlikely.