It sounds like you are not familiar with how a circular polarizer works. By rotating the lens, you are changing the angle that the polarizing filter blocks. At one angle you might block the reflections from windows/water, rotating 90° usually will start to effect the sky so the blue gets deeper. So as you rotate your sunglasses, you see the similar effect.

"I read that as "

that's an issue where you're not familiar with the subject, and have misinterpreted common words used by those more familiar with the subject.