I think they probably used typescriptlang.org because typescript.org was registered in 2006 for a CMS called Typescript.

What is the hype train you associate with typescriptlang.org? "Lang"?

I associate it with "golang", the search-optimized way to refer to the language Go, from the world's largest search company.

Before golang there was rubylang, clang, racketlang, dlang, slang, etc. Seems like a pretty common convention for language websites not limited to a single organization. Be used “Kit”, but I’m not familiar with anyone else that did (and NeXT used it long before they did).

Sure. But would you refer to that as the "hype train"?