I'm guessing from the title of that article that it is intended to be a joke, to illustrate the impossibility of having a fare-free sytem, rather than, as it at first appears to be doing, supporting such a proposal.
(c.f.'s Jonathan Swift's "Modest Proposal", where he suggested that poor Irish parents should eat their children in order to prevent them from becoming a social burden)
I have actually lived somewhere where a fair part of the city public transport system was free to travel on (trolleybuses and trams, but not buses - which I think were in any case run by private operators, not the equivalent of the city corporation or council; there was only a very limited local train service, and that too wasn't free).
This was in the mid-90s, "somewhere in the former Soviet union": so there are numerous factors that don't make for a direct comparison with the UK.
Anyway, it was clear that after a couple of years of this arrangement, lots of the trams were running around with missing windows, a shortage of available rolling stock had meant that several routes had been reduced to the bare minimum or in any case had no timetable that could be relied upon; and the trams were a favourite place for street drinkers to ride back-and-forth on.
It was nice to be able to travel around for free, but there was no way that that system could have been relied upon or was viable.in the long term.