It depends on how the source categorized the information and how Microsoft classifies the Xbox One versus the Xbox One Series (whether as being two actual different consoles, or two versions of the same console.)
There is only one entry for anything related to Xbox One as far as I can see so I expect the 12 it notes are distributed across all versions of the Xbox One, or that there are 0 dedicated games for the Xbox One Series proper.
https://en.wikipedia.org/wiki/Category:PlayStation_5-only_games
Gee, wonder why.
Here are the trends with previous consoles:
PS1 : 455 -> PS2 : 512 -> PS3 : 180 -> PS4 : 58 -> PS5 : 15
Xbox : 106 -> Xbox 360 : 214 -> Xbox One : 12
Nintendo 64 : 129 -> Nintendo Wii : 328 -> Nintendo Wii U : 38 -> Nintendo Switch : 174
So the Xbox one series (aka Xbox one 2) has zero dedicated games?
It depends on how the source categorized the information and how Microsoft classifies the Xbox One versus the Xbox One Series (whether as being two actual different consoles, or two versions of the same console.)
https://en.wikipedia.org/wiki/Category%3ASingle-platform_video_games
There is only one entry for anything related to Xbox One as far as I can see so I expect the 12 it notes are distributed across all versions of the Xbox One, or that there are 0 dedicated games for the Xbox One Series proper.