"style and feel" are entirely subjective.

If I give DALL-E or MidJourney a picture of myself that I took (and therefore I own the copyright), and ask it to "Recreate this picture in the style of Pixar", am I violating Pixar's copyright?

What if I decide to model it myself and deliberately imitate Pixar. Have I violated copyright?

What if I decide to model it myself, and it just happens to look similar to Pixar, because I've watched a lot of their movies and it has influenced how I model people in 3D animation. Have I violated copyright?

What if an AI model took the Barbie movie and added a filter to change the hue of every pixel and altered the voices to have Australian accents instead of American accents?

I wonder if Disney would sue if you tried to sell and distribute despite 100% of the pixels and audio file not exactly copying the original.

(Rhetorical question, Disney would definitely sue)

I think early YouTube movie uploaders tried this angle but ultimately failed.

Question - Does it knowing what the style of Pixar is and knowing to read it constitute trademark infringement instead?

The answer to all of your questions is no

Exactly. The court would consider other things like the impact of your modified copy and whether it competes financially with the original.