That does not need to be the case (seeing that you probably meant this in jest, I still will take it on). Assuming the cat is already a higher dimensional being, which I feel is valid as it can move between them.
Imagine a Cube going through a 2D plane. You would see a cross section of the cube depending on the angle it goes through. The same would be the case for a hypercube in 4D and 3D (different effect as different cross section though).
So I would argue the comic is correct.
Being pedantic it is added detail. As native Americans did it, even if they still do it, they could have originally/historically not done so.
And also are there tribes/larger groups of native americans that did stop doing it? Then that statement is even stronger