You're right that rm won't be enough, and the "Success!" isn't really a success.

But likely shred won't even work, because SSDs overwrite other blocks when you perform a write operation, for wear leveling. I'm not sure if there's any hope of erasing something from an SSD besides physically destroying the SSD.

>I'm not sure if there's any hope of erasing something from an SSD besides physically destroying the SSD.

I was under the impression that TRIM/UNMAP would erase the flash blocks currently associated with some sectors, is that not the case?

Generally I don't believe that TRIM securely erases anything.

https://security.stackexchange.com/questions/109916/does-the...

Shred and similar tools may not work properly on SSD with all the sector remapping going on, and most current Macs have SSDs for their boot volumes