This is some BS. Players are probably better off having a hobby that they do on their days off and Tua, for as unskilled a QB as I think he is, did materially improve over the course of this season.
For some reason golf is always used as a metaphor for negligent laziness but I guarantee you every NFL player has something recreational they do for 3 or 4 hours on off days. Video games seem to be chief among them and that's fine too.