>anyone capable of significantly contributing wouldn't need an on-ramp
That's approximately why I was skeptical, although I want to frame it a bit differently. I expect that the most valuable contributions to AI safety will involve generating new paradigms, asking questions that nobody has yet thought to ask, or something like that. It's hard to teach the skills that are valuable for that.
I got the impression that RAISE was mostly oriented toward producing people who become typical MIRI researchers. Even if MIRI's paradigm is the right one, I expect that MIRI needs atypically good researchers, and would only get minor benefits from someone who is struggling to become a typical MIRI researcher.
I was mostly skeptical because the people involved did not seem to have any experience doing any kind of AI Alignment research, or themselves had the technical background they were trying to teach. I think this caused them to focus on the obvious things to teach, instead of the things that are actually useful.
To be clear, I have broadly positive impressions of Toon and think the project had promise, just that the team didn't actually have the skills to execute on it, which I think few people have.