That sounds about right. Anything not immediately destroyed in the explosion or air blast was likely destroyed by the concussive shock of the detonation, which probably put out ELF waves down to about 1 Hz at the detonation site of about 190 decibels.
That has got to be close to something like an earthquake hitting 10 on the Richter Scale. Keep in mind that these centrifuges are delicate, precise instruments which do not tolerate being moved or shaken.
I saw video of one of the bombs hitting the mountain and one observer somewhere who saw it described it as so bright, it was like looking at the Sun. I bet they could see and hear the attack from 20 miles away, mayber feel it 100 miles away.
To that I have no doubt. The fact that little shows from the surface indicates that most of the destruction was directed downward into the mountain and out the tunnels. Everything inside was in the path of both the explosion and the airblast, which itself probably created a pressure wave through the air of the facility approaching 1200 mph, or about 4X the velocity of the strongest F5 tornado.
Mathematically (inverse square law), such a pressure wave would have about sixteen times the destructive power as the worst tornado blowing through that underground plant. And that is just the parts not directly reached by the bomb detonation itself.
The GBU-57 was purpose built expressly to kill targets just like this.
