The author explicitly calls out the existence of all of these tools as being the problem. They seem to want a canonical version that TypeScript itself officially supports.
TypeScript: We can write our own type file format!
Situation: There are 15 competing type representation formats
Though while there's a lot of type-data tools, are there actually a lot of type-data formats out there right now? I've been using zod, and it doesn't have one. You have to use code to tell it about a type. Someone did make a library to let zod load types from pure data, but the format used there is... typescript source code.