Where did you find that statement? Outside of WoW, LoL, and DOTA 2 (essentially MMOs or MOBAs), console gaming is the largest and most profitable market. Especially for AAA games, you aren't competitive or making the money you could if you aren't on Xbox or Playstation.
He's still right though, which is a point you glazed over. Those three games alone probably outnumber console gamers, especially since a huge amount of console gamers are casual gamers as well, and you could name dozens more PC titles with huge playerbases. Add to the fact that nearly every console game releases on PC unless an exclusive is forced (very rare these days), the majority of gamers are on PC. Hell, it's enough of a temptation to draw out previously exclusive markets... Halo is coming to the PC. Almost all of the Final Fantasy series is coming to PC, and Final Fantasy 15 has a strong chance of doing it on its release. Valkyria Chronicles, a beloved ps3 exclusive, PC. Dark Souls 2, finally to PC and done right. Metal Gear Sold Ground Zero and Phantom Pain all coming to PC. And triple A titles? The Witcher 3 and Dragon Age Inquisition, currently two of the hottest and more talked about games, PC.
To top it off gamers are literally the major driving force behind the video card market, a niche luxury market like specialty cars and parts, and the fact that it's healthy shows interest. I think even adding up the recent exclusives on consoles the PC market would only be a little behind, but then adding all its own exclusive titles (the mobas and mmorpgs we can play in ADDITION to the same console games you can, games like Elite Dangerous and Star Citizen) PC just blows ahead. Plus we can still use controllers on the games we choose! I have my xbox and ps3/4 controller all synced wirelessly with no delay or issues thinks to a little gizmo I bought.
Please do not misunderstand me. I really hate this whole PC super race bullshit. I own every single console except an xboxone and I sold my 360 (and I'm including consoles all the way back to atari and stuff like the virtual boy). The only reason I don't own the Box is because it's Microsoft - rare is it that one of their games does not release on PC. Sony has all the RPG exclusives I love to play and it's the only reason I have their consoles. I will KILL for Persona 5. Still, PC is the ultimate gaming experience. I could never touch Skyrim on a console, unmodded, and I wish you could see my friend's mind explode when he made the jump.
Some people may be satisfied with consoles. That's fine, there is literally nothing wrong with them and if you're happy with it then that really is all that matters. Still, speaking objectively, speaking logically, PC really, truly, is the ultimate gaming platform. No, it's not perfect. Some console exclusives will make you whimper, and the price isn't for everyone, but there it is.