Aggressive anticheat not supporting Linux is not a fault of Linux. It is a fault of the aggressive anticheat and the games that decide to use it.
They quote "If a game has an aggressive anticheat" and then state "The determination of the average Linux user to ignore the faults of Linux", which is accusing Linux of being at fault for the aggressive anticheat not working.
FWIW, I am not alone in that interpretation since this commenter reached the same conclusion: https://news.ycombinator.com/item?id=47718389
But I don't think we can conclusively say either one of our interpretations is correct.