It's not the games themselves that was the arguement. More "how we play them".
How did you play a 7th gen title? Probably using a 360 or Dualshock 3 controller unless you played the Wii (and even then, you could use the GameCube controller for many titles). I presume it wasn't any different for a 5th gen console considering I still have a couple 2-decade old Dualshock 1 controllers.
How did you buy a 7th gen game? I bet you went to GameStop or Wal-Mart like my dad & I did in 1998.
How did you look at the games? I don't recall any hologram displays being around in 2008 and VR was an absolute joke. It was the punchline to an AVGN episode and treated as sci-fi schlock in cartoons and movies. So you probably played 7th gen games on a TV screen. No different from a 5th gen game. The resolution just went up to 720p.
The 7th gen game consoles were still little quirky boxes you hooked up to the TV, and you still put discs in them. Or SD cards if you're talking about handhelds. Other than the N64, this was the same thing a decade prior. Other than cartridges instead of SD cards, handhelds were still roughly the same deal.
Graphics, physics, and audio obviously improved tremendously from 1998 to 2008, but the mediums on which we experienced them didn't.
In 2020, the primary differences from 2008 will be vastly more downloadable titles, fewer physical games, more wireless options, possibly upgradable consoles akin to a PC, online streaming, VR support, and motion controls for VR. So actually, there will be more changes than the article suggested, but still not an utterly shocking amount.