Probably Greek, though it’s hard to tell, and you’re right they don’t say it. I’m not too familiar with the history of the region, but I believe that area shared a similar material culture as nearby Hellenistic states, and was eventually ruled by Rome, so Greek would make sense. Might be common-enough knowledge to locals that they didn’t even think to mention it, but anyone who knows for sure please correct me.

The thing that bothers me most about that piece though is the photos (not the publication’s fault). The archaeologists broke most of the basic rules of archaeological photography. If I was their supervisor I would have insisted they straighten their sections, re-clean, and re-take all those photos. Those are terrible shots of an amazing find.