Hey, I can't speak for this guy, but I said something similar.
My advice of 2700-3000 was based on personal experience being a person at about his same size, height, and training level not too long ago. I also cross-referenced by using a couple online calorie calculators, which gave me numbers from ~2500-2750 per day for maintenance.
As far as the protein goes, 1g per pound of bodyweight is a simple goal that is easy to accomplish for a beginner. I'm not sure on where I stand regarding consuming more than that (1.5g or 2g per pound of body weight), but I wouldn't recommend anything less.
Just my two cents, and I in no way mean to answer for anybody else.