I think they kinda realized something was up when it was not only Expert 13+, but Advanced 10 as well. Pandora Paradoxx was Expert 13+ and Advanced 11, and the closest is Raputa Expert 13+ and Advanced 8+
There are locations where you can play maimai in the states! Round 1 arcades have an older version of the game, running offline. There are arcades that have the new version, it’s just tricky to find them.