Sure, these fenders increase the unsprung weight. Mounting on the axle is the best way to control clearence as opposed to body mounting of fenders with unknown actual wheel vertical travel. I doubt these tires grow much through the lights. The benefit of this method fender scores higher on the my decision matrix than the weight.
A second look at the pix tells me this is a very nicely constructed car.
What is that thing I think I see under the front of the front fender? A camera, lights?? or is is it me.... the usual PUI? yup, wine.... Lee in KC explained PUI to my satisfaction, so there.