He's wrong and right at the same time, great games bring more people, but people inflate too much on exclusives as the sole card carrying.
The north american launch of Dreamcast was a perfect plan: Cheap console that had a game scoring 10/10 by everyone (Soul Calibur) the highest rated sports game (NFL 2K), the revival of a big franchise (Sonic Adventure) and other many great games with a steady cadence to be released week after week (Code Veronica just five months later) rather than wait six to twelve months after launch, a vastly superior experience to Saturn and even compared to the PS2 early on. That didn't stop the console from selling yearly even less than the Nintendo 64 was doing aligned, needless to say that the PS2 launch alongside the imminent launches of Gamecube and Xbox cemented their exit despite having a strong lineup, people were bitter by the way they pulled out of the market for a year and half and didn't have trust.
The WiiU, which lets face it, while the naming was bad it wasn't the cause of its downfall, instead it was that most of the Wii sales geared towards an audience that barely plays videogames and its third party support was going down in shovelware after 2-3 years, you can notice how it was outselling the PS360 by 2:1 and ended its career just 13-15 million ahead, the Wii customers had moved to mobile, while the Nintendo core public had moved mostly towards Playstation and Xbox over the generations. The central question was: Why would someone pay 300 dollars for something a little bit more powerful than its competitors at the twilight of the generation, with a poorly used concept of tablet controller and nearly zero third party support? Its exclusives sold in the 5-10 million range which was above the average for the PS360 minus Halo and Uncharted, Nintendo had massive attach rate yet that had little conversions into new customers.
Its like Android vs Apple, everyone knows that there Androids for all pockets and tastes yet in USA for example the vast majority goes to Apple regardless of all the cool stuff you can do with Android phones. For Xbox, being the utlitarian platform rather than creating the idea of "cool brand that every kid who wants to be cool begs for it" is what is working for them.