It is well known that Tim Sweeney has an unfounded hate for Linux in general and routinely makes up lies to support his idiotic views.
Especially in the case of a game like Fortnite, which uses EAC, it would require enabling a checkbox and recompiling once to make it compatible with proton, which in itself is a rather unnecessary measure imposed by Epic.
So no, it’s not simplistic, it’s literally how it would work in this case. As demonstrated by the countless other games which use EAC and did just that.