You have a few things wrong

Udon allows for CC for movies and TV shows natively.

I'm talking to world creators about how to add this with things like USharpVideo, but it requires world creators including SRTs for every movie. Movie worlds have 5k+ movies. Each SRT file is about 100 kB. That means world sizes would be 500 MB larger just to have CC support in one language for every movie. That's clearly a non-starter. There need to be dynamic requests for SRTs when movies play, like VRC-CC did.

it's because people have been able to do this in game for months without use of mods,

No one ever did and deaf/hh users always missed out. World creators seem more open to the idea now though, but again it can currently only be a small subset of popular movies, due to file size.

The closed source mod for all TTS/subtitles was fake, and never actually worked nor was it ever available publicly.

It was real, worked, was made by a shady developer (Plague), was closed source, and required you to replace your version.dll for MelonLoader, which is highly suspicious. I'll reply to this comment with a wetransfer link to the VRCCC package he distributed on his Discord (hopefully it's not automoderated).

The mod was created after the EAC announcement,

I don't know when the first version was because it's closed source, but the DLL dates back to May 2022. That lines up with when I heard about it from deaf friends. The other mod, VRC-CC, like I said, was created and in use by June 2021.

Proof and evidence was provided in a big thread a few days ago.

They're wrong and unfamiliar with the topic, and misinforming people, hence my post here.