I think red interiors are fine on any 991 as long as it has the black dash top and steering wheel as this car does. The black dash top then gets red contrast stitching which I think looks great.
There will always be a buyer for a car with buckets, even a Turbo. You see this particularly with second hand GTS cars.
Having said that, I think the red / black 2-tone interiors go best with a GT silver exterior. And that would perhaps make me think twice about this car.