I don't buy this. It's like saying someone has a remarkable physique or remarkable fitness only because they used PEDs when it actually requires a significant amount of effort and discipline regardless of what's in the gas.
Certainly targeted studying, tutoring, test accommodations, etc. can help. But the difference is at the margins.
Test prep helps the average person test at their level, but there are some people who can at best make excuses like "I must have skipped a line when I was filling out the form" and for those people the one thing that helps is hiring a ringer to take the test for them.
School on the other hand offers vastly greater options for people to turn financial and social capital into false achievements in terms of chiseling for grades, expensive sports and other activities, etc.
You still have to listen to and understand what the tutor says, though. And it's not as if the tutor is saying anything that's not published in books or on YouTube videos - the only real benefit a private tutor could even theoretically have is that he could potentially find a few different ways to explain a concept until the student understood it.
Yes that's one benefit. Also with the focus on one student the tutor can gear lessons to best suit their learning style and current knowledge.
Really anyone who can afford a tutor would benefit from one.