I do not know the answer to your question. I have heard those that have had laser then later went off hormones for surgeries later had a facial hair regrowth to a small degree.
I have had laser and about 50 hours of electrolysis. The two people doing the electrolysis both said electrolysis is 80% effective (thermolysis with galvanic) the 1st pass in killing the follicle. 20% of the hairs will grow back; although, thinner.
For GCS electrolysis is recommended, 3 passes over a year, due to regrowth.