It was not included in the initial list and its arrival is logically a surprise: a new title has just been added to Xbox Game Pass.
When the April games were announced at the beginning and in the middle of the month, NBA 2K22 was not among the offers. His very recent arrival from April 28, alongside Bugsnax and Unsouledin the Xbox Game Pass is then a surprise.
The PC is not affected by the arrival of the game of basketball. Only the Xbox One and Xbox Series versions have been made available and could presumably remain available until the next iteration of the series is released. This is particularly what happened in the case of 2K21Last year: added in March 2021, then left the catalog when 2K22 hit the market.