I'm quite certain I'm none of those things. I'm gainfully employed and well-respected. Yet I'm not on LinkedIn. Why? Because I prefer to minimize my social media footprint, because I've heard a lot of things about LinkedIn that rub me the wrong way, and because I don't see a clear value proposition.
So no, my absence from LinkedIn has nothing to do with me being a bad candidate for a job. If you assume it does, you miss out on a good hire.
I think any statement of the form "a person who doesn't use product X is necessarily a bad candidate" is absurd, unless product X is something like disinfectant and the job is something like doctor.