I don't think someone buying their games is disappointing to them, no. I DO think they would ideally like to convert all of their traditional buying customers into Game Pass subscribers, which is why they've aggressively given away trials and deals to get people onboard. They know some percentage of people wont, and in those cases they obviously still would much rather have your $60 a pop than nothing. Likewise I think they'd much rather people bought games digitally than physically, despite still offering physical games.
And in a world where the publisher of a game is aggressively trying to turn buyers into subscribers, sales alone are an irrelevant metric for a game's success. They're a small part of the larger picture of consumer engagement with the game.