Too late for me to edit my comment but for anyone curious, I asked Michelin for clarification and it turns out the tire "spokes" are made from a composite rubbe

Too late for me to edit my comment but for anyone curious, I asked Michelin for clarification and it turns out the tire "spokes" are made from a composite rubber and resin embedded fiberglass. So it has the flexibility/movement of rubber but is high strength from the resin embedded fiberglass. It's on an aluminum hub just like any other tire.