He's likely referring to the New TSR, which did make a pretty racist race section for a game. But they already are basically dead as a company, if not actually bankrupt.

The only other scandals would be WotC getting sued for labelling Adnd stuff as racist, when WotC made at least 2 books with racist art in the 2020s. Or the Zac S lawsuit, where a pornstar OSR creator was accused of stuff then won the lawsuit so easily he looks like the nice guy in porn. Reggie (LotFP) is also weird, but not the average creator. He's basically just an eccentric artist.

The OSR is way less bigotted than WotC. Hell Shadowdark was made by a lesbian and she is very well regarded even by people critical of SD as a system.