Sweeney is lying through his teeth here. From things he has said previously, it becomes very clear he hates the whole idea of linux. When steamdeck became a thing, it was clear he was salty about how it would shine a light on it as an alternative OS. With this interview, by now it seems he is beginning to bend under the pressure and at least pretending that “oh I have nothing against such and amazing platform, so sad we can’t support it” in order to not look like an ass.
Which is an out that will bite him in the ass, they can support it, so soon interviewers won’t be asking, “why can’t you support linux” but “why won’t you”.