In the search bar it says "Updated 2 weeks ago", like if there were additional recent comments or actions in this thread that we cannot see.
So it could actually be OpenAI Whisper model, for which we have the final binary format (the weights), but not the source training data, but it is the best you can get for free.
Yeah, it'd be nice if we could all use 'open source' to mean 'open weights' + 'open training set', instead of just 'open weights'. I fear that ship has sailed though. Maybe call it a 'libre' model or something?
Maybe they're really using a truly open source model (probably not) but the meaning of the word is muddied already.