@dean8015, As far as I know, no such apps / applications talk back to the iPhone and “leaves” a trace about being used.
Same way when I recover (or try to recover) data from a disk / SSD, when I run my apps, it only goes sector by sector seeing what’s there. If data were written to a sector, and not overwritten it can bring it back.
There are only two ways of truly deleting data:
# Overwrite every single sector with new data, to completely wipe what was there (back when I took my certification, DoD standards required the sectors to be overwritten 7 times in order to be deemed deleted.)
# Expose the disk to high intensity magnetic fields (degaussing). That will destroy the data if powerful enough
None of these will leave a trace on the disk (other than the fact that the data has been deleted). Disk(s) show zero information about having been attempted recovered.