No it’s not. Not absurd, at all. My senior year of highschool, I benched 315. The max was a one rep max done at the beginning of the football season - our coach discouraged one rep maxing in general but allowed it this one time of the year. If you benched 150% of your weight, you got a t-shirt. I weighed 195 at the time, and so I got the t-shirt.
After high shcool, I slacked off working out completely, instead choosing to focus my efforts on drinking and trying to get laid. I didn’t pick up lifitng again until the summer before my junior year of college. In about a month’s time, I was back up to three reps of 275. By the end of the summer, I was back at 305. I quit again and did not lift until after I graduated.
The summer after I graduated I started lifting again - within four weeks it was like I’d never quit. I continued to lift intermittently through law school and was in the low threes by the end of my third year – I never focussed on increasing my maximum lift.
Once I started practicing law, I quit lifting again for another couple of years. The next time I picked it up, I was around 27 years old. I was back to three reps of 275 within about two months.
I quit again for a few years and picked it up again in my early thirties. By this point I weighed 235 (fat). Within three months I could lift 280. I quit again and haven’t since picked it up, but I am fairly certain that if I did, I would be back in the high twos in less than six months.
Today I am fat and haven’t worked out on anything in over a year. I am built much the same way Williams is now. I was horsing around at a friends house the other day and lifted 205 with ease. It’s not hard for me to imgagine a guy his size and his age lifting 285 if he’s been at it for years. Not hard at all. Are there a hundred reason why he might not be able to? Sure, but that doesn’t change the fact that it’s not absurd, expecially for someone who’s just naturally strong.