I think it is somewhat clear what they're getting at, and it's explained visually in the picture further down. Though maybe "crushing against the golden ratio"

I think it is somewhat clear what they're getting at, and it's explained visually in the picture further down. Though maybe "crushing against the golden ratio" is not a good way to phrase the situation. It sounds a little bit like the stairs form a converging series, but from the text further up and the picture it seems pretty obvious that the author intends to convey that the step size of the stairs approaches a (power of) the golden ratio from above.