That's fair in a sense but it also looks like they moved the preview paywall much earlier in the chapter, 22% instead of 46%.
Towards the middle of the chapter they start asking intuitive questions about how coefficients in the power-series map to the real-life concepts they've been discussing "childishly" up until then.
It's a major turning point and I wonder if you just didn't get the opportunity to see that shift. It's infantilizing right up until it isn't.
