A whistle blower and an axe grinder are two different things.
I disagree; one could be a whistle-blower with an axe to grind.
Definition of axe grinder: working for an ulterior purpose or toward a selfish end - Definition of AX-GRINDING
What makes a person an axe-grinder is the hugely biased agenda and the willingness to put a huge skew on information. That's why their intrinsically such a problematic source.
I think the word you're looking for is "deceiver", because if they're putting a skew on information and the "skew" isn't truthful, then they are lying, purposefully.
A person can be critical of someone / something else, but still not be an axe-grinder.
The above definition says that's exactly what someone is, in this instance (to be clear, was your statement "Axe grinding makes someone/something a bad source."). "working for an ulterior motive" = "person can be critical of someone /something else"
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