That the referenced way of doing something is the easiest current way to do it

No, it isn't intended to be figurative - it is literally saying that right now, doing X is the easiest it has ever been (i.e. at no time in the past has it been easier). So it is another way of expressing the superlative. It has never been easier = it is now the easiest ever. Other examples are: International travel has never been cheaper; Passing the top level English exam has never been harder.

It means that although recharging through vtu before was easy, Today, it has become easier than before because some new device or something has made recharging the VTU easier.