Have you ever experienced a developer/publisher limiting access to a jouralist or outlet due to negitive coverage of a game or company? EXAMPLE: Rumor has it Randy Pitchford was very guilty of this after all the allegations surrouding "Colonial Marines" surfaced.

Oh absolutely. It's not even that rare. But honestly, after a game or two things calm down and the relationship continues. This industry has a short memory when it comes to that sort of thing, and everyone wants to start on a positive note for the next project.
This isn't a remark on Pitchford by the way, I didn't see any evidence of what you're claiming myself. I'm speaking in general terms.