I was going to glibly respond that you should change any compromised passwords. On reading the notification it doesn’t seem like they have provided exactly which sites were affected, so I understand the question now, and can only suggest researching the Stealer Logs breach. Not particularly helpful sorry.
Ah yes, no wonder alarm bells went off when reading this guy. Pro Trump, Covid skeptic, the pattern emerges.
The author talks at length about competence and respect for expertise, then conveniently avoids any mention of climate change. My guess is they’re that type of pseudo-intellectual who is a “climate skeptic” rather than being an actual critical thinker. And of course they know better. Than the experts. Who are competent.
Further investigation turned up this
https://www.troyhunt.com/experimenting-with-stealer-logs-in-have-i-been-pwned/