"Biased but across the spectrum" is nonsense.

Purely semantic arguments aren't helpful to anyone.

The word "bias" clearly has two senses in this context. The original term from signal processing indicates a persistent offset, which got appropriated in politics to reflect the idea of a "lean" in coverage. So now "Bias" means "politically charged in some direction or another".

So you can have a "biased" term ("occupy") next to another biased term ("tea party") in a search. And it's reasonable to call the whole thing a collection of biased terms even though by the original definition I guess you'd say they cancel out and are "unbiased".

Language is language. It may not be rational but it's by definition never "nonsense". Don't argue with it except to clarify.