How sophisticated is 5ch's overseas IP block?

Does it extend to commercial VPNs (NordVPN and the like), Tor exit nodes in Japan, Japan-based AWS/Google Cloud servers?

How about domestic VPS providers (Sakura Cloud, IDCF Cloud, GMO ConoHa/Altus/etc)?

Does 5ch block all traffic that's not from a Japanese residential ISP (e.g. au Hikari) or university network?

And can 5ch detect if you're using VPNgate?