who are these jobs geared for?
The real answer is only known by the ones posting such job offers, so you will have to reach out and ask them who are they intended to, or what kind of applicants they seek.
Alternatively, any decent job posting should indicate the kind of applicant they seek and the skills or qualifications they expect on candidates.
However, the fact that they are posted in University Campus already hint to us that they are intended for Students or people that frequent the University. That is, graduates, undergrads, PHD students, etc..
IIRC, when I was at Uni I saw similar job posting on a big board on my faculty, where job offers were pinned or taped onto. You say the pay is low, and yes I do recall the pay was low.
In part because they were intended (I guess) to help students make some extra income while still taking their courses and their regular jobs (in other words, part time or a few hours a day)... But also due to the fact that those "research" jobs offered were more about physical or repetitive tasks the usual research involves (checking on the Petri dishes, passing tests to study subjects, etc.). So, it's "research" but you were not actually doing the PHD-level analysis or the complex modelling the actual research involved.
At least those were the "research" job offers I recall were offered in my Uni and posted on such boards.