Is this the reason why it got flagged?

I flagged it because your silly clickbait title is a misinterpretation of both the contents of the article and narrates a enormous jump to a ridiculous conclusion. Its fake tiktok gosh-wow horseshit and does not belong on hacker news.

So for the record the current title is: So you think Linux is safe from the NSA? You couldn't be more wrong

Personally, I flagged it because that's very misleading and it's not a backdoor.

If anything, the original title should have been edited in the opposite direction, to not use the word "backdoor". Or to add [sic]. But "a backdoor" without "in Linux" is not super egregious.

I changed it to the original title of the post. Is it ok? If not I am adding [sic] as you suggest -but I've never seen it in other posts here

I'm not really sure what's optimal but I removed my flag.

It is still flagged