So you’d lose all rights on pictures of yourselves if they were generated by AI? Would this be true even for nudes?

Copyright and privacy rights are different.

I did not refer to privacy rights. If you post a photo of yourselves online, you're giving up on a tiny part of your privacy rights. So my question still stands: would running your photos that you have taken of yourselves through a diffusion model rip your copyright of your photo?

Yes, anything AI-generated should be public domain including the AI-generated picture that used your photo as input.