It’s not open source. Llama is proprietary, the license hasn’t changed. Just like the source code to windows leaking doesn’t make windows open source.
.. assuming that the weights are copyrightable and that you agreed to license them from Meta (fill out the form). Weights lack at least two requirements to be eligible for copyright protection in the US and many other jurisdictions. For the US, the weights are likely to be considered public domain (unless new legislation is introduced) but we'll have to wait for the courts to know for sure.
I feel the same regarding people moderating comments to oblivion because they disagree on HN and have commented about this recently to dang.