This is when the moron/Nike shill chimes in and says "it's the foam."
It's not the foam, it's the plate(s). Because without the foam, the shoe would be unusable. A worse ankle-sprain risk than it is now. The design of Kipchoge's latest shoe, with multiple plates, foam, and air, is brilliant, and beyond an assist. It's damn near a motor. No, it doesn't create energy alone, but when worn by a runner, who is running anyway, it offers energy return far beyond anything rational.
This is no different than a motor on a racing bicycle that stores tiny bits of energy on mountain descents through the braking process (like a Tesla), then releases it on uphills. This would be illegal.
The only good part of this shoe development is that it's a dead-end for the user. See: Rupp. And others.
Much like the LZR (?) swimsuits that re-wrote the record books, this too needs to be banned. I believe carbon bats in baseball have a ban somewhere too, right? This isn't unheard of.
Just watch Dubai early next year. I bet 6-10 are together late, with most coming in under 2:01 or 2:02, and all wearing this shoe. Tell me when someone wearing a shoe that's not a Cheaterfly, or a competitor clone, runs under 2:02.