He was the director of Bits of Freedom, one of the founding organisations of EDRi[0] (think: European EFF). That being said, he left that spot a few years ago and this is just his side project, but saying that he's not a "real digital rights activist" is just ridiculous on so many levels.
Whatever he did in the past, this whining about FB not linking his database with copyrighted script -interlaced with non-issues like how a platform he does not use spells his name- doesn't help anyone much now. There are bigger digital rights fish to fry.
[0] https://edri.org/