I don't think the issue is performance though. The unspoken part of this comparison is in bold:
"Linux vs Windows tested in 10 games. In the games we could find that work on linux, the performance was 17% faster on average. In all the rest of the games, Windows worked 100% better."
I wonder what database is in place that would allow them to determine what weapons were made after that date. It seems there would be a lot room for getting around that aside from just buying used.