Actually it is possible. You just have to write over the data several times. I’ve seen the technique used to get the old data under it and severas writes (It used to be like 7) and no way you’re getting the data back.
Also keep in mind the data is encrypted! So they’d first have to recover what was there...then decrypt it! Good luck with that.
“Actually it is possible.”
Yes I know... I headed up a DOD project 20 years ago to do exactly that. Government agencies were unable to take advantage of warranties on their disk drives when they had classified data on them. We wrote the software to wipe the drives. In those days, disk mechs were over $1000.
The software was certified by the DOD, but wasn’t used much because it took way to long to scrub a drive. (many hours) Plus you often had to replace the pc board on the drive to even run it. The final solution ended up being to remove the top cover and remove the plasters and physically destroy them.