A good article on how unlikely they had ARS:
https://www.reddit.com/r/chernobyl/comments/twab17/is_radiat...
https://www.reddit.com/r/chernobyl/comments/twab17/is_radiat...
> there are no photos or eyewitness accounts.
The other resources provide satellite images of excavations and eyewitness accounts from Ukrainian hunters and biologists.
Anyway. Do your own research, come to your own conclusions.