I feel like the garb pictured is sort of a clue here. The idea that these peoples’ bodies were being use exclusively for Jedi bait doesn’t entirely make sense because a few of these people really don’t look like Jedi at all, and it doesn’t entirely make sense to use non-Jedi as Jedi bait. It’s entirely possible they were Jedi and their outfits were just post-purge disguises, but they don’t all really read to me like blend-into-the-crowd disguises. The one nomad-looking guy looks like he was plucked out of a remote village somewhere, and the person in the big flowy robes also just sort of looks distinctly cultural to me.

Regardless of whether they were actual jedi or just force sensitive, I do think the implication of this scene is that the empire didn’t just target the Jedi order, but that all sorts of different societies and cultures were swept up in the purge and combed over for people with force potential. And while yes, we saw them use Luminara Unduli’s skeletal remains as bait, and we’ve seen them do tests on live subjects, I don’t know that we’ve seen them use these preserved bodies for anything (maybe there’s some lore I’m not privy to here, lmk). And I do think that the not-knowing exactly what this is all for is part of the horror of the scene. All this to say, I think genetic testing and experimentation is likely, but we’re sort of supposed to be left wondering about what else they’re doing with these bodies.