Arrington assumes that just because nobody told him about Buxfer's shutting down (which is probably all that really happened here), their investors don't know it either.
So then he speculates that the founders are scamming or making fools of their investors.
If he keeps posting like this, it is his own reputation which will suffer.
I find the last clause of your post to be a bit ludicrous. Arrington seems to still have some kind of reputation, but not because of the quality of his postings. There's been innumerable speculative and generally shoddy posts over the years.
So then he speculates that the founders are scamming or making fools of their investors.
If he keeps posting like this, it is his own reputation which will suffer.