Hi @OPNightMarine,
Given that the Steam Deck runs on a custom version of Linux, I highly doubt that Epic would discontinue support for all Linux, as it would be super detrimental to their creators (though it does have its own Steam OS Devkit separate from the Linux tools).
That being said, there has been no official news so all we can do is speculate. Given their competition with Steam, I suppose it’s a possibility.