Yes. The DNS A records for the stallman report website were the same as his blog at one point. Not sure if it's in the report, but someone also queried his blog's IP address with the stallman report host and was given back a LetsEncrypt certificate for Stallman Report draft site:

https://archive.ph/4yGYf

So I think it's clear he's behind it. Even if he didn't write all of it, he certainly helped and hosted it, and in the HackerNews thread he pretended it was someone else's report he wasn't involved with.