In either case, I have never read that ADT alone can KILL prostate cancer cells.
Were that the case, every single man with PCa could be “cured”, ADT discontinued and a complete cure for prostate cancer could be announced.
However, I do think something like that - a la Pluvicto - could be possible some day, wherein a radioactive/hormonal agent could be infused that only goes to PCa cancer cells and kills them completely. Might not be that far away, in fact, when you look back over even just the last 5 years and see how much progress has been made.