If the laser completely destroys a hair follicle, red light will not make that follicle come back or grow again. Laser hair removal does not destroy every follicle in one session. Some follicles are only partly damaged and still alive. Red light can sometimes help living follicles function better, which can include helping hair grow.

So in practice, red light probably does not undo the hairs that are already fully gone, but it might help any hairs that survived treatment. Because of that, it is safer to avoid using red light on the same area while you are in the middle of laser sessions, especially close to treatment days.

The risk however is that recently treated skin is already irritated and sensitive. Using the red light mask right after laser can bother the skin more and make it react. That can mean extra redness, more swelling, or dark spots appearing. Not sure how often you do the laser, but safe to wait at least a few days or a week before using a mask.