TIL: "Doom + Doom II" defines a new standardized compatability level for mods, ID24
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ID24
https://doomwiki.org/wiki/ID24
ID24 is a specification and standard specifically aimed at mod authors and mods in general. It builds on top of the possibilities shown in the MBF21 standard, acting as a super-set of it, and was first implemented in the KEX Engine source port of Doom + Doom II. It was first used there for the Legacy of Rust episode.
I had wondered about how some things were done with the new episodes. I'm glad they released some documention and kept the standardization so that the rest of the broader Doom community can build off the new release.