Having read that book, yes, "Octopuses are cool" is a pretty good summary. It's worth reading it for that.

On the biology part, if you never have heard of terms like "efference copy" it will be interesting food for thought about what consciousness might be, but no "solution" really. And you'll learn that an octopus is a ten megapixel screen, but that's just the first point again. If you only want that first point, there is also a "My Octopus Teacher" on Netflix, which is great in its own way.

If you wanted to read about human intelligence, I suggest "The Secret of Our Success" by Henrich instead.