Yes, when you play on PC, you have full controller support. This has been confirmed very recently by several different people who contacted Larian support. I will be playing it with xbox controller. I also have ps5 controller, but I think it sucks bear balls.
Thx! So far, I haven't managed to see anyone using a controller. (Somehow I missed it on the last PfH) I don't own a PC, so my steam deck and the built in controller are all I've got.