That repository links to a site https://www.modpagespeed.com/ https://www.modpagespeed.com/ which in turn links to a different repository https://github.com/we-

That repository links to a site https://www.modpagespeed.com/ https://www.modpagespeed.com/ which in turn links to a different repository https://github.com/we-amp/ngx_pagespeed https://github.com/we-amp/ngx_pagespeed It only has one extra commit, which deletes RETIRED.txt which was added in the repo you linked. So at the moment it seems someone is intending to continue development. And might even be working on it, but haven’t pushed any work to the main branch.