This is exactly it, open source is not just the availability of the machine instructions, it’s also the ability to recreate the machine instructions. Anything less is incomplete.

It strikes me as a variation on the “free as in beer versus free as in speech” line that gets thrown around a lot. These weights allow you to use the model for free and you are free to modify the existing weights but being unable to re-create the original means it falls short of being truly open source. It is free as in beer, but that’s it.