Tbh, I workout in the gym anywhere from 4 to 6 times per week, depending on work, home etc. I also have a pretty decent home setup in the house too. I would class myself as having a relatively decent physique, as I have decent muscle definition etc.
However, there's absolutely no way I could get into that kind of low body mass shredded physique in a year. The main reason is the nutritional part that I find complex and difficult to maintain. I eat pretty ok, but I don't have the self discipline to do a huge cut.
For me, to get to that kind of shape in a year screams steroids. The gym I'm in here in Ireland - Flyefit - is very mixed and isn't an iron house type setting. But, there's been occasions when it's extremely obvious when a few lads have started juicing, especially in a gym that doesn't really cater to bodybuilders, as such.
But tbf, a multi-millionaire extremely fit ex-player who has access to the best chef's, PT's, nutritionists may be able to pull it off naturally. He would have access to a likely high standard home gym and has a huge amount of time on his hands. It probably is possible for someone who fits that criteria.