Is the person with the dog able/willing to keep the dog comfortable indoors until the coat grows out. Life changes and not everyone can continue to do upkeep on a heavy double coated dog years later. Might have sounded like a great idea at the time, seeing that cute roly poly litter of pups and beautifully groomed parents on a manicured lawn, but jobs, kids, household duties, spouses, aging parents, (and chickens, lol) all can majorly creep into your available time. Any healthy dog can be shaved down and live to tell of it. How you care for them afterwards is more important than the day they were shaved.
If you are not an experienced groomer, you may clipper burn him by accident, causing much worse problems than a sunburn would. Are you prepared to deal with whatever you find under all that hair? (moles, blocked sebaceous glands, ticks, fleas, sensitive flaking skin, raw, infected skin folds. Careful of cutting the skin too. It can be very paper thin under that hair, easy to pull up a tiny fold and slice clear through it with a good set of clippers and not even know it.) It is backbreaking work, especially without a grooming table, and/or an uncooperative or older, crippled dog. I don't think I'd do it for less than $100, myself, friend or no.