Hey, there; I answered your question on Reddit, but I'll put it here as well:
Back when Brad started the show, he struggled against YouTube's copyright system taking down episodes for little to no reason, so when Blip became the preferred medium of choice for reviewers, he migrated there. Unfortunately, Blip eventually got sold in 2013 and then shut down two years later, taking down all of its hosted content with it.
Brad is slowly reuploading as many of the "lost" episodes that he can, though, so if you're looking for something, odds are it will come back. Are you seeking a particular episode?