Yeah, I realize others have already said true and pointed to some facts, but there's no question it's true. Rodman's best season was probably, what, about 16 boards per game? And early in his career he wasn't nearly the rebounder he was as his career path evolved.
Wilt, and for that matter guys like Bill Russell as well, absolutely devoured the glass. Wilt pretty regularly had 25-30 rebounds, if I'm not mistaken. That said, it was probably easier when you were far and away the biggest, most athletic player on the court. I don't believe for a second he'd pull down that many these days, going against the big, athletic players in the modern game.
Just like he never, ever would have scored 100 points in this day and age.