I don't think it's a big deal provided there's not too many "lifetime associate profs". To explain: I expect people to take 8-15 years to go from Assistant to Full. 8 would be someone with prior experience as assistant elsewhere, 15 is someone who is struggling a bit or has had leaves of some kind (mat/pat/health). Anyone past 15 is likely never to get to full. Most research active faculty will take 10-12 years.
So when you look up people there, check the proportion of "older" associates. It might just be that the complement is renewing and nobody has made full yet but this will happen soon.
At the same time, from what you say, this is a small department that has, like the rest of the institution, changed purpose relatively recently. So I would expect the mean time to full to be slightly longer than usual, because there are changes of mentality that take some time.
In any event, there is no harm in bringing up the topic, if you do get an interview. You can also "shop around": identify one or two people who seem to be quite active in research and ask to speak to them while on site, that's completely okay.
In my view, it is in that department's best interest that the person they hire comes in with a good understanding of the situation, whatever that situation is. Otherwise, they risk losing the person quickly and in particular for a smaller department, that has consequences: running another search one or two years down the line is not necessarily always feasible.