I really hope I am completely wrong and that someone will correct me, but now believe Stephanie is wearing Hoka Carbon Rockets during the race today, which is Hoka's answer (predecessor actually) to Nike Vaporfly 4% with a carbon spring inside
at first I thought they were Tracers, because Aliphine is clearly wearing Tracers and I thought this was just the other women's colorway
but then I finally found a larger photo and saw the yellow bottom, which is an RMAT layer that the Tracer does not have
was hoping maybe Claytons or the new Mach maybe, but the stack height doesn't line up, it's too shallow
in fact it looks exactly like a women's version of the men's carbon rocket that they demonstrated at a trade show
it also has a similar diagonal split that you see in all carbon spring plate shoes, the vaporfly and the new brooks
https://imgur.com/IV9lQbO.jpg
https://imgur.com/TmbAvj6.jpg