That guys an idiot. There was an actual edited clip going around that was spliced together to make the bombings in that episode seems as if they happened in the boston marathon.
Seth/Fox etc was not calling the whole episode a hoax, just the clip that got edited and put on the net… They simply pulled them down because they felt it would be offensive after the bombings… Kind of like a few movies that edited out the twin towers when 9/11 happened (originally shot with them in it)
I watched that episode last week on hulu… Dudes an idiot and anyone else who doesn’t know how to read or google around a bit.