Gonna go with "Jack Maxey's full of shit" on this one. Unless he found a magical, previously undetectable zip file that infinitely compresses already compressed audio, video, and doc files, then it's a distraction narrative. Real gentlemenly of him not bashing Isaac. But as he says, "let the data speak for itself". So far, the data contains bullshit images that have been disproven by an army of coomers on halfchan. Yes, even coomers are contributing to the GA.
If they were recovering deleted files, the deleted files would've had to be contained in a compressed folder with the ability to compress enough extra data to still fit inside of a harddrive whose block allocations would've still limited all stored information to a 500 GB drive that was 3/4th of the way full with data that wasn't deleted from the beginning. Then, it would have to be the case that nary a file was ever written over a single block containing said hypothetical compressed file/folder for it to be recoverable at all, otherwise the entire file would've been corrupted an unopenable.
Jack's story doesn't add up; literally.