The score says how it ended. xG says how it should have ended: it is the sum of the chances each shot was worth, not an opinion about the game.
A draw, but Juventus created more (1.69 xG against 0.09) — points dropped.
Juventus: −2.1 for the season (7 in the table). AC Milan: +2.1 (5). The gap between points and xPTS is built from matches like this one.