Reading again through discourse meta forums, it seems they choose “by the community” because post are only hidden when a certain threshold is reached, sometime can be a single “high karma” user flag, others are a group of “regular karma” users flags. So I suspect the system doesn’t know if the post was hidden because X number of flags.
I’ll keep searching if it’s possible to show the type of flag to the reported, because right now it’s just plain text.