That 1800 is a lot of weight but, from the photo, the way the weight is dispensed he is not moving a true 1800. Leverage is on his side, something like lifting a wheelbarrow with 200lbs of cement bags in it. Compare this to lifting that 200lbs of bags off the ground without that leverage. Or putting a crowbar under a heavy object you want to raise, with that crowbar resting on a 4X4 near that object. I have seen that type of machine in a lot of football training room and is used a lot. Mainly for short burst leg drives. But it does not compare to the old fashion BB squat for leg power and all around condition. The BB squat (and Dl) is still king.
That extra loaded BB must be at lease 2/3's distance from the actual lifting platform, giving it less a true force (weight) to deal with. Pics or video's never tell the whole story of anything when it comes to lifting (this goes for BB'ing pic's also). Now if the Bro squated or DL's 1800, that would be impressive. Or at least have a pic of him standing straight up or a video of him holding that top position for 3 seconds or so.
Seriously doubt any one will squat 1800 but who knows. Benches are getting near or over the 1000lb mark. Paul Anderson (in the '50) squated around 1000+ in regular workout. True or not, I do not know but his legs and hips looked like they could move a tank. Seen power rack workouts where guy supported 1100 but only doing 1/8" travel distance, at best. Lifting is more than 50% mental anyway. Nice to see what happens in the future of PL'ing.