The other is where he's doubting that pedophilia is harmful to children. So yeah, that's pretty well "in support of pedophilia." That one isn't subjective, it's the words he typed, and try as I might I can't find an interpretation where he's not saying pedophilia is fine.
If I said "I am skeptical that infants smoking weed is harmful to them", does it mean that I smoke weed, or that I smoke weed around infants? Or that I actively support it? Or do I (perhaps wrongfully) state that I am skeptical about claims around the topic?
Personally I think pedophilia is just about the most awful thing in the universe. I wouldn't engage in in depth speculation about how it affects children, because I think it's a horrible thing to think about, but the fact that RMS engages in those conversations doesn't make him a pedophile. And it definitely doesn't make him an "active supporter" of it.
https://stallman.org/archives/2006-mar-jun.html#05%20June%20...
Please note that for the purposes of determining statutory rape, a person under the age of consent is not mature enough to give consent, so there cannot be "voluntary pedophilia."https://stallman.org/archives/2012-jul-oct.html#15_September...
This second seems to touch lightly on specific cases where the definition of "child pornography" should perhaps be in question -- but given RMS' stance from the former quote, it's not clear that this is the entirety of his viewpoint.