Knowing or having experience with Redux isn’t going to cause me to pick you over someone else who doesn’t list it for a job where I’m paying you hundreds of thousands of dollars. I look at other skills.

I would not can it in isolation, but if I see a comma-separated list like: “proficient in redux, react, html, JavaScript, sql, kubernetes, word and excel”… then yes, you don’t make the cut.

Or if you list your Microsoft qualifications or your MIT continuing education courses. These are all negative signals.

What would be an example of a positive signal?

Unfortunately many recruiters do look at that. I'm always a bit disappointed when someone wants me to rate my Java experience, or complains that my CV doesn't mention REST experience.