FWIW, the easiest way to dispel the fallacies pumped out by these individuals is to ask how much time they've sunk into a reasonably contemporary competitive online game. I almost never meet people who have these delusions about anticheat being ineffective that also has actually invested significant (>500) hours into the games that they're appropriate for.
(people who work with spam and fraud/abuse prevention also usually don't have these delusions, because the underlying economics are similar. turns out that actually having experience with a thing is enough to disillusion most people of stupid ideas about that thing, who know?)