This is some kind of spammer. Spammed the entire casino topic with his identical posts. Wrote there in a row as many as 7 identical posts. And plus there casino representative has already responded to him. And this spammer was on the forum today, but did not comment. And most importantly, the casino representative referred to the Russian language page of the casino rules, which clearly states that quote "In the event of there being a discrepancy between the English language version of these rules and any other language version, the English language version will prevail".
https://bitcointalk.org/index.php?topic=5433885.msg62741338#msg62741338 OP was tricked with two sets of rules but the spamming makes it tough to side with him.
It doesn't change the fact the casino's rules are dubious and confusing. It's not the duty of the customer to investigate every translations of the set of rules minuciously trying to find discrepancies between them when signing up at an online platform.
The casino even gave him 3000$ back as goodwill gesture, so why not to give him his 18,000$ and ban his account after that? Then I would believe that is a goodwill gesture, because the way it was done was simply a cunning gesture.
A ban against russians for the reason we know very well which one it is should be explicitly stated on the website, including the signing up screen.