From everything I know about PG and YC, I highly doubt they themselves would take that kind of action unless a post was outright slander. It just seems Nixonian.
That said, there is obviously quite a bit of goodwill on HN for PG and YC. You could call it fanboyism if you were feeling uncharitable. To me, that seems a much more likely scenario - an anti-YC submission getting a bunch of flag votes, rather than an intervention by admins.
Agree, plenty of goodwill from me as well, which is why I was surprised to see a popular voted question about a YC company having trouble suddenly disappear then. Without a good explanation it makes me lose trust in the transparency of HN, whether due to flag votes or direct intervention.
That said, there is obviously quite a bit of goodwill on HN for PG and YC. You could call it fanboyism if you were feeling uncharitable. To me, that seems a much more likely scenario - an anti-YC submission getting a bunch of flag votes, rather than an intervention by admins.