This is false. The chain of custody and integrity of digital evidence is pretty much a solved problem. Digital forensics is a fairly mature field.
This is not to say there aren't issues with some of the tools, such as Cellebrite's clown show.
The mere possibility that a "clown show" of that magnitude can exist is evidence for the lack of a solution to the problem of digital forensics.
Trust and Computers don't go hand in hand [2].
[1] https://softwareengineering.stackexchange.com/questions/1947...
[2] https://pluralistic.net/2020/12/05/trusting-trust/#thompsons...
Sounds like someone took code from their homework assignment and added a few fun extra credit features to screw with their psychology professor.
I can imagine how it would be pretty confusing to stumble across if you hadn't read the paper though :-)