I don't know... I came up in a time where weight cutting was extremely bad, unhealthy, and rampant. I was one of the few cutting a lot of weight and even to this day as a man closer to 60 than 50 my weight isn't much more than my walk around weight was then.
Good genetics, better food, and a lot of rum.
These guys on the right? Hopefully they have had their expectations tempered and don't cause themselves too much bodily harm on the way. Student comes before athlete. For ~99% of these guys mind, body, and soul health leads to success more so than pain and suffering does.