I believe this is the guy he's talking about. By linking to this, I'm not saying the allegations are true, but it's the discussion I've seen mentioned elsewhere, which I believe OP is referring to:

https://x.com/LundukeJournal/status/1944505084919816337

> Tomorrow, July 14th, at the annual Debian Conference (DebConf ‘25), Jeremy Bicha will be speaking.

> Bicha, as we learned last week (after he defaced an open source wiki page, calling people “Nazis”), is a registered sex offender — convicted after having committed “thousands” of assaults of young children.

> Bicha, an employee of Canonical (the parent company of Ubuntu) will be representing both Debian and GNOME at DebConf 25.

Edit: Digging deeper into the X threads, this seems to be one of the root the sources of the claim:

https://wng.org/articles/the-high-cost-of-negligence-1617309...

Edit 2: Just to be clear, I myself am a Debian user. Not a hater. I'd just hate to see Debian's reputation needlessly tarnished by having the wrong people promoted to publicly represent the project.