One thing other answers have missed is that some ssds encrypt data before writing and obviously after reading (this prevents a swap the storage controller type attack) A secure erase on such a device consists of changing the read/write key. Takes milliseconds. Irrevocable (unless you find a way to read previous contents of the key storage)
How did the flap and, indeed, starship have enough control authority after the burn up during re-entry, to complete the soft landing?
The booster done good as well of course…
Flipping awesome outcome… Beers all around.