There are whole teams and pipelines dedicated to making sure data is deleted on all media, tapes included. The long tail can be affected by things such as a mac

There are whole teams and pipelines dedicated to making sure data is deleted on all media, tapes included. The long tail can be affected by things such as a machine holding a bunch of GFS chunks from your files that went to the hardware repair queue in the meantime. Those chunks might not even be that useful without the others stored on other machines, but in the general case you can't make guarantees that e.g. they don't hold information that a skilled person could use to identify you.