Does Max use paint jobs? There are a couple things that he could have been talking about.
a) Federer might actually change racquets everytime Wilson releases something.
b) Federer is constantly changing paintjobs.
c) Federer keeps experimenting with different configurations of his custom stick (head, beam width, string pattern, grip size, etc).
d) Max has no clue what he's talking about.
I think Max is talking about c but that's just me.