Important dev (Chris Belcher) who was working on bitcoin privacy (Coinswap) has suddenly no more activity on github since July, without posting an explanation

Does anyone know the details?

His work log: https://gist.github.com/chris-belcher/ca5051285c6f8d38693fd127575be44d

His profile: https://github.com/chris-belcher

Twitter: https://twitter.com/chris_belcher_

I was excited about coinswap for the future of bitcoin. His work also was under a grant from Spiral (Dorsey) https://spiral.xyz/#grants

Has anyone seen any activity or heard any explanation? Is anyone else going to pick up his work if he stopped? Did some intelligence agency scoop him up (pls no)