It’s encoded as a regex which you can find here: https://github.com/LemmyNet/lemmy/blob/78702b59fd56f767f3d5612bfd60e294979f91f8/crates/utils/src/utils/slurs.rs#L74
It’s honestly not a terrible list, but there’s at least one entry in there that falls victim to the scunthorpe problem, and it sucks that it’s not something administrators can easily customize.
Edit: looking through the PRs it seems like they made the filter customizable at some point, so this is a little outdated. The whole communist thing still applies though.
So I listened to that entire video and I still don’t know what corporatism actually is. There was a lot of talk about how various fascist regimes were corporatist and how it’s about all the classes working together, but no actual explanation of what that means in practice.