From what I’ve read Roiland has little to do with the show beyond voice work since season 3. It’s possible that he knew something but it’s also possible that he just dismissed it as the general low level sexism that a lot of men joke about. A lot of it is baked into the show itself and Roiland had openly talked about being attracted to characters on the show, Summer in particular.I was thinking more of senior people. There's no way in hell Dan Harmon didn't know.