The “how will we know if it’s real” question has the same answer as it always has. Check if the source is reputable and find multiple reputable sources to see if they agree.
“Is there a photo of the thing” has never been a particularly great way of judging whether something is accurately described in the news. This is just people finding out something they should have already known.
If the concern is over the verifiability of the photos themselves, there are technical solutions that can be used for that problem.
That’s not how synthetic data generation generally works. It uses AI to process data sources, generating well-formed training data based on existing data that’s not so useful directly. Not to generate it entirely from its own imagination.
The comments assuming otherwise are ironic because it’s misinformation that people keep telling each other.