For reference, an original source is something like:
https://stallman.org/archives/2006-mar-jun.html#05%20June%20...
The so-called "article" is a one-line comment on a post in what looks like a 2006-era Twitter-style feed. I think one would see a similar amount of crazy from virtually anyone posting this much, without a filter.
Read it.
Do you believe Stallman is a pedophile on the basis of this comment?
I do not.
I've seen similar comments in academic texts, in the context of cultures where this happened and was acceptable (e.g. Greek pederasty in ancient Athens). From what I know of Stallman's communication style, I read this comment in a similar, if much less informed, light. He's making an incorrect but academic point, poorly.