How else do you want to reproduce a model if you don't have the training data?

Just reproduce it? Copy the weights. What I think you want is the ability to improve it, to make what in copyright would be called a derivative work.

Reproduce meaning do the same process yourself and make sure you get the same output.

That isn’t possible, training is non-deterministic.

It doesn't have to be.

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I don't recall scientific studies giving other scientists the original person's used in a study, set back to before the study. Ir the beakers they used.

You might find this comparison stupid, but I think it is rather apt.

Reproducing a work does not mean you get all the exact same things that were originally used.

At best, I would agree releasing the index is valuable for understanding how the model was made.

But frankly, I don't think the people who demand all this effort are arguing in good faith.

You do not have access to the compute necessary to "reproduce" what they made. So it is a pointless request.