For comparison, I'm a powerlifter. I'm 238lbs currently. My maintenance calorie intake is roughly 2450kcal on average. I aim for about 2800kcal on training days, and equivalently lower on rest days to roughly meet that average. Fitting 220g or so of protein in that is not that hard: I can eat 400g lean chicken and get 100g protein for <900kcal. I can tack on 100g beef jerky and get another 50g protein for less than <300kcal; which leaves it almost hard not to meet the protein target within my calorie goals.

If I were to eat 3387kcal to meet 207g protein, I'd be adding 1-2kg a week.

That's well in excess of the protein synthesis a typical human male body is capable of. In other words: A substantial percentage would be fat. Quite possibly I might end up adding 1.5kg of fat a week on a diet like that, which would get me quite a lot less protein than what I do on my current diet.

For a body builder exercising heavily 2-3 hours a day, on steroids (otherwise lifting heavily for that long every day would just be a total waste of time), that calorie intake might be reasonable. Or for someone who combines the exercise with a highly active job, like say, construction.

It'd be interesting to see that diet brought down to 2400kcal or below with the same protein levels. I suspect it would look a whole lot less pleasant (and that diet looks awful to me in the first place, but I love my meat).

(Now, protein amounts this high are in the "might as well, just in case" level - the possible incremental benefits hinted at in the literature are as far as I know quite marginal - so a lower protein intake would not necessarily be bad, and then it'd quickly become a lot easier to meet it with a reasonable calorie intake)