I think you're misunderstanding their point and mixing it up with other commenters. They are saying everything is available, but there are license restrictions

I think you're misunderstanding their point and mixing it up with other commenters. They are saying everything is available, but there are license restrictions on how you can use it. They're not asking for more code or data. It's source available, but it's not "open source" in the historical usage by programmers. Microsoft could not take their model weights and use it. It's not open source.