It’s more likely an admission they have to trampoline every gpl function in the kernel which isn’t really easy to do and would let that kernel module run on any other kernel. Otherwise they would have to do a shim like nvidia which would mean a whole other level of issues like saying we support Linux but only Ubuntu which as a non Ubuntu user would mean to me they do not in fact support Linux. I’d vote with walle here but I already don’t own this game as my friends said the user base is terrible years ago but this just means there is no reason to buy any of their games.