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This is a poor excuse, they actively don’t support Linux: rocket league had a Linux version, which was dropped and now Linux players can’t play it
Just as a heads up, while they did drop the Linux client, unless it’s been changed very recently you can just use the Windows version through Proton/WINE and play that way.
Which isn’t an excuse for what they’ve done, I only mention it in case you or someone else didn’t already know.