because this is a P2P release, or more specifically, I bought this game, cracked it, and uploaded it. This release is not from SCENE, so it's not available on srrdb
of course, unless you don't believe me or Steam page :)), because I bought it from Steam page. BTW, actually you don't need srrdb.com website if you know how to check from https://steamdb.info/, there for each game, it has a list of game files with SHA1 code. You can use some tool to match each file you downloaded, with steamdb.
I love how you help us to understand all the systems and feel save! I am checking the website now to see if I can find the SHA1 code and how to check it ♥
(Note: it only works if you log in with your Steam account).