I'm pretty sure Histogen will be like a stronger version of minox. It will thicken up thinning areas but won't grow hair where there is no hair.
I think it will complement HTs...from my own perspective; I have been told I am a good HT candidate, my hair recession is slow and crown in strong. I should be straight in the HT chair but the element of doubt about what the future will bring is stopping me. I guarantee that if Histogen (or womever) release a project which can halt my hair loss, I would feel much more comfortable undergoing surgery.