Matt,
I don't think anyone is disputing the potential damage that sun can do, particular the effects of undue exposure at a young age.
But rather than some well intended sun police gatekeeper denying them an entry point to golf, an opportunity to mingle with and connect with some of the most successful and influential people in their community, their chance to have their college paid for(Evans Program) and the opportunity to earn real money in a safe, mostly wholesome environment etc. etc...
(To say nothing of getting him outside, getting exercise and AWAY from Social media)
Why not just spend some time educating them on proper sun care....?
I mean if a kid can learn all the elements of caddying, reading greens, care of the course, ettiquette, psychology, getting along with people, dealing with grown up bosses, etc. etc.
Don't you think he could figure out how to apply sunscreen and put on a hat?
You might save him from the exposure to sun while caddying, and free him up to what...go to the beach?