Depends how you define "lifting weights" All boxers do some sort of muscle building gym work from core routines to pure power exercises. Now if you mean lift weights as in have a dedicated weight training program? Then no, I don't know of any.
Floyd doesn't lift weights, or if he does it is grabbing the five pound ones, shadow boxing, and doing the neck thing, which a lot of boxers do for punch resistance and neck strength - a narrow neck snaps more. In 24 hour fitness on Trop and Decatur he never ever touched a weight - he ran on the treadmill upstairs and went down to play basketball. Rahman there put up serious weight, though. They would all hang out with Ellerbe there. Hatton for legs, Mosley - a lot of old school trainers who produce good fighters don't let their guys touch weights. Roger Mayweather used to have a little sheet of things to do he would give to starting fighters, and one of them was don't lift weights.
In the recent alla ccess series it showed Floyd in clips oin the seated bench press machine. Not sure if he was lifting heavy or just doing reps.
Weight lifting for boxing is totally fine, as long as you do compound movements and don't isolate the muscles too much. Most boxers do deadlifts these days.
With the worst form ever seen in the history ever seen. His next video will be 'Tyson visits the chiropractor'.
I see him doing many plyometric and ballistic drills which work your anaerobic system and aerobic....muscular endurance. Surely you don't think world class sprinters get their massive legs sizes from lifting massive amounts of weight, right. Comes from explosive activity and repetition.