You're assuming that they are artificially increasing the price point, thus lying about the "real" reasons for the price increase of their games.
if their plan is to offer lackluster games at 80-100USD... what makes you believe people are going flood game pass to play shit?... No, people ain't gonna sub nor buy shitty games.
the price increase will have to reflect the value and quality of the game more than ever. and because this is true, increasing the price of games while keeping GP at or lower than $20....will exacerbate Game Pass's implosion