I think he is saying that building inspectors, plumbers, doctors, nurses, carpenters, etc should be licensed. I hope you don’t disagree with that.
Milton Friedman stated that most, if not all, government licensing is against Freedom and damaging to a free society.
Milton Friedman has written at length about the "evils" of government licensing. He works are pure genius.
If you have a chance read up on his writings. In a few of his writings he specifically addresses the damage done by requiring doctors to be licensed by "the government."
He has written at length about how "the market" solves ALL the problems that government licensing is purported to solve. Hint: government licensing involves "the monopolistic power (force) of government -- source of corruption and sadistic abuse.
His writings are a joy to read because he views human action from the viewpoint of Liberty. His logic is impeccable.
If you read his works just on licensing you will gain a new appreciation of Freedom and true capitalism.