How do you replicate CERN experiments? The LHC? Hubble? LIGO? LISA? At least this paper is reproducible by people who have the compute, and many universities have super computers.
Even at home, you can verify the results by replaying the games against stockfish. You might not be able to replicate the setup at home, but that does not mean it is not science.
Comparing projects done in the open with multiple different universities, on public funds, with something done behind closed doors with only personnel from a commercial entity is pretty far-fetched.
Why? How are any of the factors you mention related to verifiability? How does being supported by public funds with academic personnel from multiple universities make LIGO any more verifiable for me at home? At least I can run these games against my stockfish, thus verifying the result. The method I cannot verify, but being able to verify the results is already more than most of science.
Even at home, you can verify the results by replaying the games against stockfish. You might not be able to replicate the setup at home, but that does not mean it is not science.