I suppose language changes. I just prefer it changes towards being more precise, not less.
In terms of functional role, if we're to compare the models to open-sourced games, then all that's been open-sourced is the trivial[0] bit of code that does the inference.
Maybe a more adequate comparison would be a SoC running a Linux kernel with a big NVidia or Qualcomm binary blob in the middle of it? Sure, the Linux kernel is open source, but we wouldn't call the SoC "open source", because all that makes it what it is (software-side) is hidden in a proprietary binary.
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[0] - In the sense that there's not much of it, and it's possible to reproduce from papers.
Not sure if the code is required under an open source license, but it's the same issue.
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IMO, source is source and can be used for other datasets. Dataset isn't available, bring your own.
In this case, the source is there. The output is there, and not technically required. What isn't available is the ability to confirm the output comes from that source. That's not required under open source though.
What's disingenuous is the output being called 'open source'.