The awards are more heavily influenced by album sales than subjective judgements of musical quality.

Do you know who Jon Batiste is?

The album won on quality. The sales spiked after the win.

https://www.universalmusic.ca/press-releases/jon-batistes-we-are-catapults-to-global-success-after-winning-album-of-the-year-at-the-grammy-awards/