S2 is very active on Twitter, he may respond if he is inclined:
X (twitter): https://x.com/s2_underground
He also has a subscription site on Patreon, so I believe you can message him there (requires subscription):
https://www.patreon.com/user?u=30479515
He used to list a proton email as well. Email me at admin@s2underground.com if you would like the email address.