Yeah I believe I read that same thing somewhere. I’ve been googling looking for more precise information on the calculation with little luck.
But, correct me if I’m wrong, it still seems that no matter what you try to use to create a uniform replacement level player between eras, it still does not account for things like differences in runner speed and the exit velocity of batted balls because we don’t have that data from earlier eras. So, technically, Cal’s comment really isn’t that bad, especially with the explanation that players continue to get faster and stronger. Beltre likely had to field balls at higher exit velocities and throw out faster runners to get outs. Not saying that I necessarily agree with Cal’s comment, but I do agree with the premise in his explanation that players are getting faster and stronger. And maybe I’m just trying to give Cal the benefit of the doubt, but after hearing that explanation I don’t think it’s as bad a comment as I originally thought.