It’s really a legal semantic. Per the FDA website:
“Several manufacturers received FDA permission to claim, “permanent reduction,” NOT “permanent removal” for their lasers. This means that although laser treatments with these devices will permanently reduce the total number of body hairs, they will not result in a permanent removal of all hair. The specific claim granted is “intended to effect stable, long-term, or permanent reduction” through selective targeting of melanin in hair follicles. Permanent hair reduction is defined as the long-term, stable reduction in the number of hairs re-growing after a treatment regime, which may include several sessions.”
I would avoid doing laser on female faces. There is a tendency for induced growth on that area so I’d avoid doing laser on that area for a different reason than what you were told