If someone gives me an executable that I can run for free, and then says "eh why do you want the source, it would take you a long time to compile", that doesn't make it open source, it just makes it gratis.
Actually executables you can reverse engineer it into something that could be compiled back into an executable with the exact same functionality, which is AFAIK impossible to do with "open weights". Still, we don't call free executables "open source".
And yes, like other executables, they are not literal black boxes. Rather, they provide machine readable specifications which are not human readable without immense effort.
For an LLM to be open source there would need to be source code. Source code, btw, is not just a procedure that can be handed to a machine to produce code that can be executed by the machine. That means the training data and code is not sufficient (or necessary) for an open source model.
What we need for an open source model is a human readable specification of the model's functionality and data structures which allows the user to modify specific arbitrary functionally/structure, and can be used to produce an executable (the model weights).
We simply need much stronger interpretability for that to be possible.
Zuck knows this very well and it does him no honour to speak like, and from his position this equals attempt ate trying to change the present semantics of open source. Of course, others do that too - using the notion of open source to describe something very far from open.
What Meta is doing under his command can better be desdribed as releasing the resulting...build, so that it can be freely poked around and even put to work. But the result cannot be effectively reversed engineered.
Whats more ridiculous is that precisely because the result is not the source in its whole form, that these graphical structures can made available. Only thanks to the fact it is not traceable to the source, which makes the whole game not only closed, but like... sealed forever. An unfair retell of humanity's knowledge tossed around in very obscure container that nobody can reverse engineer.
how's that even remotely similar to open source?