I haven't seen anywhere claiming they are open weight (although their last similar model, NLLB was).

They say their leaderboard and evaluation datasets are freely available. Closest statement I've seen in the paper, "Our translation models are built on top of freely available models."

It is not open weight as of today (unfortunately, for the reasons out of control of us the authors, we weren’t able to release the weights). All we could release is part of the evaluation data. I hope this will change in a while.