In the case of diffuse thinners, I think Tsuji might be a cure depending on the physiological causes for the hair loss. In people with DPA, it will unequivocally be the cure. In those with DUPA, it's a much more complicated answer.
Often times, DUPA is caused by an underlying health problem unrelated to androgens. One example is cell apoptosis caused by cancer treatment. This induces DUPA hair loss on the head. Since cancer treatment is (hopefully) not an ongoing thing, if there is hair left afterwards, this treatment will be able to use the little left over to create a full head of hair. If one has a genetic issue that causes progressive thinning across the scalp, we are to assume there is something either inherently wrong with the scalp/follicle, or there is some physiological issue that needs to be addressed.
I can say with a degree of confidence that this treatment will not work for everyone. Some people have progressive thinning of scalp hair that affects the sides and back as well. If this means there is a defect or unfixable damage to all the follicles, one would think that culturing the cells from these follicles would yield damaged follicles as well. However this isn't certain, since harvesting and combining these cells may yield brand new follicles that haven't been affected by the offending physiological genetic condition. In this case, you could expect the hairs to last just as long as the old ones did (potentially decades).
I guess the point is just that scientists don't really know where the damage resides in many cases of DUPA, so it's hard to say if this treatment could yield healthy follicles from the cells of damaged ones. There's still a light at the end of the tunnel though, since IPSC solutions are on the horizon that create brand new cells from drawn blood. So eventually everyone will be able to get their hair back. Even patients with immune system problems, provided they address those problems first.