If you are asking about the "micrograd" video then yes a little bit. "micrograd" is for scalars and we use tensors in the book. If you are reading the book I would recommend to first complete the series or atleast the "micrograd" video.
I agree! What NumPy is doing is actually quite beautiful. I was thinking of writing a custom c++ backend for this thing. Lets see what happens this year.
Free book: https://zekcrates.quarto.pub/deep-learning-library/
Ml by hand : https://github.com/workofart/ml-by-hand
Micrograd: https://github.com/karpathy/micrograd