It really depends on the time and what projects we had running, and the needs we had in term of experience and background at the time! It doesn't mean anything about your adequacy. Try again, things change every month!

In general for remote positions, we look for people who've done it successfully before (or some shape of something like that - for instance I had experience as a research assistant for a prof from afar), or that have a lot of experience in their field of expertise.

(note: I'm an engineer, I'm not really involved in hiring stuff, so take what I say with a grain of "needs to be confirmed by competent authorities")