Both were corroborated with evidence. I'm scanning this post for new evidence and coming up empty. The fact that American action was technically plausible has always been known.
One might twist Hersh claiming he has an anonymous source as new information. But that's the closest we get. On its own, that's not sufficient to advance the discussion in a meaningful way because it presents no new facts.
I can't find any proof whatsoever as to who actually did it from the western authorities claiming to investigate it either though. In fact, there's been little to no news or updates at all since the incident.
Not an evidence.
> the source
Remains anonymous. Also, not an evidence.
It’s a signal to pay attention to the issue. To keep an eye out for evidence. It’s not evidence per se.