Of course it's real tennis. The guys on the senior's tour can crush the ball just as hard as anyone on the pro tour. It's just the speed and the endurance that has faded for them.
I don't have a problem with Rios being there, but if he starts to get an ego about his dominance, I think he's really confused. He's younger than Henman. He's much younger than Agassi and Sampras. As long as he keeps his trap shut and shows nothing but respect for the other guys, and talks about how he enjoys the senior's tour because he gets to play with players that he would have never had a chance to play with before, I'm fine with it.