It's true that digital sensors capture light using primary colours (RGB) and that colour film, negative or positive, produces colours using CMY complementaries. Whether or not that RGB setup confers more colour accuracy is debatable and would depend on lighting conditions (time of day, angle of sun, sunny or cloudy conditions etc). You'd also have to call into question the accuracy of the printer's calibration, the purity of inks, the RGB --> CMYK conversion, and if the prints were C-Types made using Lightjet printers, the reversal system still comes into play. And since everyone perceives colour slightly differently, it probably isn't possible to achieve 100% accurate colour representation anyway. The guy's talking bull$hit IMNSHO.

Cheers,
kevs