I'm not convinced the visuals would be fair use. However it was certainly done in partnership with Namco. It's celebrating Pac-Man's 40th anniversary and says a

I'm not convinced the visuals would be fair use. However it was certainly done in partnership with Namco. It's celebrating Pac-Man's 40th anniversary and says at the bottom of the article: PAC-MAN™ & ©BANDAI NAMCO Entertainment Inc. Plus there is a massive give away that Namco approved this within the article: We were blown away when we saw the results, in disbelief that AI could recreate the iconic PAC-MAN experience without a game engine,” said Koichiro Tsutsumi from BANDAI NAMCO Research Inc., the research development company of the game’s publisher BANDAI NAMCO Entertainment Inc., which provided the PAC-MAN data to train GameGAN. “This research presents exciting possibilities to help game developers accelerate the creative process of developing new level layouts, characters and even games.”