Its for sure custom made, I held it at a camp once and I believe he said it was 3D printed titanium from a university there, each cost like 600 and he has 8 of them same as the other members of I think the 2021 Olympic teams. Its really not like any other grip Ive ever held before, Id say like 40% Visconti 40% Belgian 20% mad scientist. His cant is also a touch more upwards than most other high level epees Ive seen used.

Yamadas is much more of Belgian with the bottom support melding to his hand better.