Reddick doesn't just say stuff. He strikes me as a genuine guy.
I've thought something somewhat similar actually. Parts of the game in the 80s and 90s were way more physical - hand-checking, for example. I also think it was much more acceptable to give hard fouls going to the rim, even though that didn't happen as often as we think it did.
But the modern game is physical in different ways. Players might not be getting leveled going to the rim, or getting pushed off their spots, but cutting off-ball is very different. Every little bump off-ball today is at full speed. If you watch the game in the 80s and 90s, the defense is a bit more passive and finesse off-ball, especially on screens. I also think the modern NBA does a really good job at contending at the rim, which means that players have to bounce off players at the rim and absorb contact. They aren't getting leveled, but they are absorbing a lot of contact.
They really are very different games. Parts were more physical and parts were less physical. Parts were harder and parts were easier.