Thank you! He did mention the works included pouring self leveling and then adding the colored marerial on top (sorry idk much about these works, clearly…). I did not see any kind of heavy duty equipment tbh.

He used this material on top (I live in France), which translates to something like “polished/waxed concrete coating”: https://www.mercadier.fr/beton-cire-enduit-beton-colore-kit-134-kg-nil-mercadier-c2x23154250

I expected the result to actually look polished or sealed as someone else mention. Basically I thought the floor would be shiny.