Lack of attribution doesn’t tell you anything. If they’re licensing their images from a stock photo site, attribution likely isn’t required.
Even without that caveat, if they feel it beneficial to pay for stock photos for an article I’m probably good giving it a pass. Most major stock media companies are buying fully into AI generation anyways, and I can’t think of too many cases where stock images really add anything to an article aside from adding to the page size by an order of magnitude.