It can actually depend on many things- Some lasers are more suited to different skin/hair combos, many people argue that IPL is less effective, I can’t even find any proper information on whatever ‘dermaflash’ treatment is (the actual product ‘dermaflash’ found is a skin analysis machine. It seems more of a renewing facial than anything else.
I wouldn’t go for this, if it were me. What the woman at this clinic said is a gross oversimplification and that seems a bit ‘off’ to me.
When something sounds too good to be true, it might just well be. If you decide to do this, go in with caution.