All of the "important stuff" is practical stop motion. CGI is only used in cases where stop motion is either impossible (fire, waterfalls, the distant backgrounds of shots) or impractical (the wide shot of a scene with thousands of people)

And as a general rule, the main subjects of a shot are never CGI.

So the point is- it's stop motion. The amount of hand crafted and hand animated art on display is astonishing.

Disclaimer- I work there. In a support role, not directly, but I'm lucky enough to get to see the insane level of hard work everybody is putting in for years and years for a single movie