You don’t need to be a genius to figure out that centrifuges installed 70–80 meters underground will be largely unaffected by bombs which are believed to have an effect down to a depth of 60 meters.
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You don't have to blow something up to destroy it.
But U-235 doesn't stop being U-235 because you pressurized or heated it up. Can't blow up atoms.
Best case, instead of a pile of enriched uranium, you now have a highly concentrated mine.
Sure, you'd have to separate it again, but getting U-235 away from dirt and rock is a lot easier than separating it from other uranium isotopes.
Even if it was stored as volatile UF6, what, you've converted it to UO2F2 / U3O8?
The expertise and equipment to develop and maintain a nuclear arsenal at scale is vastly more important.