Of course they don't. According to skittles claim, performance is still maximized with 3 sets. It is merely performance/effort which is maximized with one set.
A weekend warrior may wish to optimize performance/effort, but a serious athlete must optimize performance.
"Performance" is a variable metric. And not looking towards the best people in a field for guidance because you don't want to attain their level of achievement is, I think, misguided. If you don't do that, then you risk being taken in by charlatans.
A weekend warrior may wish to optimize performance/effort, but a serious athlete must optimize performance.