If this isn't open source/weights and can't run locally, I don't see how this is a replacement for Whisper or other open models, e.g. within Home Assistant.
It's not open weight, but the point is to be an on device (and thus local, privacy preserving) option. The article mentions that as the caveat
> What this means if you just want good transcription
> If you are on a current iPhone or Mac, the best on-device transcription engine for English is already in the operating system, and the private option is no longer the compromise option
It is local
The appeal is that users only have to download it once across all apps that use it. Instead of convincing a user to give a couple gigs for just your one app
It's a local model so it's essentially open weight such that you could feasibly export it somehow since it's already on the laptop somewhere. Apfel is a wrapper app like ChatGPT but using Apple Foundation Models, I assume something similar will happen with this transcription model.
https://apfel.franzai.com/