I think we should separate Cero d from other genres because there is a matter of scene censorship.

This issue has already been through discussion and was decided on within this community years ago that all versions are kept on the same leaderboard. Cero D is available in all regions on every platform so anyone that wants to run competitively at the top of the leaderboards have access to that version of the game.

On PS4/5 you have the option to import a physical copy of the game, you can get the Cero D version of the Not a Hero DLC by creating a Japanese PSN account and downloading it after getting the Cero D version of the main game. On Xbox One and on Xbox Series S|X you can either import a physical copy or change the region of your device to Japan before downloading the game or DLC to get the Cero D version. On PC you have to purchase the game through the Microsoft Store, not Steam, and change the region to Japan before downloading the game. On Xbox and the Microsoft Store for PC the game is often on sale for under $10USD. Check out this video for that shows how to get the game on Xbox and PC:

Having a specific version of the game that is faster is a common thing in speedrunning. In some cases there are specific versions of the game and specific versions of the consoles they are run on. This community ultimately decided to keep all of the versions on the same leaderboards, as many other communities do in this same situation. It ultimately comes to the individual runners choice on if they want to invest in that version or not.