Part of it is due to an alternate definition of comparable, which is "of equivalent quality; worthy of comparison", as opposed to "able to be likened to another; similar". It's being used as shorthand for "they aren't equivalent", and then they go to justify that assessment.

I get your point though. The form and structure of the language used, consciously of subconsciously, often conveys quite a bit more information than the words themselves impart. Sometimes this is meant to communicate or subconsciously sway the reader, sometimes it's leakage of the writer's mental state.