Paved over you say?

How did they then so quickly determine for P2 all the over "paved over" covers were secure after only destroying three multi-million-dollar cars?
Other than claims here, I haven't seen anything to confirm they were supposed to be bolted down and/or paved over.
The earliest pic post-accident of the cover area doesn't indicate any obvious bolting or shattered pavement that would have covered the cover, IMO.
Seems welding has been an adequate decade plus proven solution.