That is, what's blocked? Things that people consider misinformation. Some of it really is, and some of it is just stuff that's politically unpopular with the powers that be (which they're also going to label misinformation). And then some of it falls afoul of various copyright laws or other such.

But certainly real misinformation is a significant chunk of that. The proxy enables that misinformation (and disinformation) to bypass the censorship/blocking. So in that sense, yes, it spreads misinformation.