Since there are known and "documented" (on Wikipedia!) scandals about rigged games in Italian football - see here, or here - I don't know if anybody truly believes that this cannot happen... unless he's been living under a rock for far too many years
Too many people live in an imaginary world, and the reality is something else entirely - why should it be weird that there is bribery and corruption in sports, or that athletes are blackmailed into doing something against their will? Wherever big money revolves, crime is present - and sport is just one big money factory that everyone wants their share of. Lie detectors, however, are not something that can be proof that someone is really lying - so they cannot be the solution to the problem.
Btw, this whole VisMin cup has been temporarily suspended as the investigation was still going on. Some says the other team (the low scoring team) has been banned, while the other team had several of their players suspended and fined.