I was there, you werent. Deal with it.
No you weren't! You were sitting on a hillside somewhere close to it - deal with it!
They were in the aircraft - you weren't. You are in no position to assume what they might have seen. Airborne viz is often very different to what you see on the ground. Even if it was marginal - it was their call!
BEagle - Who makes the assessment on viz requirements at low level?