As far as I can tell, the project in the video is measuring the resistance of the cable to the "fault" location.
To be able to do this, one would need to know the loop resistance per kilometre of the cable, other wise what value of resistance you need to find is unknown.
Consider the nature of the "fault".
If the fault is a very low resistance short circuit, the project will work as described by measuring the loop resistance to the fault.
However if the fault is an open circuit, it cannot work.
Similarly if the fault is of some intermediate value of resistance, the fault location cannot be calculated.
My opinion is that this is one of those academic projects which has no practical application and would be useless in the real world.
Why would you want to copy it?
The find cable faults, open circuit, short circuit, or something in between, use a Time Domain Reflectometer.
JimB