They don't really specifically say anything in the video though as the potential cause.
To me it makes no sense because trams are powered by overhead cables and not the tracks themselves. Maybe when they were doing the testing, one of the testers had a brainwave about what could potentially happen should one of the cables sever and make contact with a rail?
Who knows, but if something has been identified or they want to make sure that it's 100 percent safe then it's good that it's being rectified.
I hardly see it as some sort of political scandal, I doubt it's even big enough to be called a storm in a teacup.
Nothing is 100% safe. We'd have no cars on the road if we had a 0% -risk policy. Not sure the issue, but if it's political in nature, it's miles too early to cash in, there's no reason for wedging the opposition this early into a term.