The wrapping has nothing to do with your cell/wifi. The wifi in the charger is only really connectable to your phone for the first few minutes after powerup of the charger (or you hold the button on the handle down for 5+ seconds).
TBH, the routing isn't THAT important. What wire does he have installed right now, and is it through conduit? If its already #6 through conduit, all you need is a breaker change(and technically, you don't absolutely NEED that, depending on where your breaker box is and what other breakers are adjacent to the 50A). In theory the worst you'll see is a nuisance trip if there's a lot of heat build-up.
Electricity is electricity, it doesn't care whether its going into a 2018 or 2021 car.
Its probably good your friend retired.