They address this in the article - they're statically linking with musl, which should address most distros, and their phrasing indicates that they're testing multiple distros too.
> Unlike our normal Linux builds, the remote server can be compiled with musl, which requires no dynamic linking. This lets it work on older distros (where before we ran into compatibility problems with glibc) and on modern share-nothing distros like Nix that don't have a global set of libraries to dynamically link.
> Unlike our normal Linux builds, the remote server can be compiled with musl, which requires no dynamic linking. This lets it work on older distros (where before we ran into compatibility problems with glibc) and on modern share-nothing distros like Nix that don't have a global set of libraries to dynamically link.