Why is thalidomide NADH called the third generation NMN?

This so-called iterative upgrade of the third generation belonging to Selifu's own brand is actually not much different from the previous two generations. And the price of the third generation is much more expensive than before, and the effect is very general after eating for a while? The price-performance ratio is not as good as choosing other brands, such as NMN with good probiotics.