You cannot counterbalance the evidence behind a claim that "refers to a bunch of studies" by citing anecdotal evidence.

You can most certainly give people a cause to actually look at the "referred to studies" to see what they actually say rather than third hand impressions given in a one sentence comment about a book. ie. To see whether the actual studies are incompatible with the prediction "If someone does intense cardio for one and a half hours (every day) AND actually ate less rather than more energy from food while maintaining this schedule they will probably lose weight".

As far as I know the "doesn't work" means something far more specific, practical and psychological that isn't particularly incompatible with the highly unnatural circumstances mentioned in Kiraly's experience. It is also something rather closely relevant to the "I did gain that weight back in less than a month" observation.