If it overheated on the dyno it would have overheated on the road eventually, now that it happened you are aware of the issue so it appears to be the fault of the dyno operator?
Whatever, your rad is swollen and blocked...install the new rad and see how it runs. It didn't get blocked on the dyno obviously. BTW how is a starter related to this cooling issue that cost $2500 to diagnose when the rad is shot?
I'm not getting this at all?