Are there any Dr. Seuss characters in that animation? No. It was done "in the style" of a Dr. Seuss primer. Guess what? Can't copyright a style. A character, yes. A story, yes. A "style"? No.
Leftists: where facts, reason, and logic don't count, and where the only thing one needs to BS oneself and one's fellow lefties is "deep, sincere feelings" that one is right.