No matter how much PS4/XBO are selling right now, they are old gen consoles.
The graph literally say "current gen consoles", so they don't belong there.
A while ago, the "Current Gen" graph was listed as "Current Platforms." The reason they did that was because of the confusing argument around whether or not the Switch was 8th gen or 9th gen.
The "Last Generation" tab has all the 7th gen consoles. And the "This Generation" tab has the PS4, Xbox One, and SWITCH. And it's been like that ever since the Switch came out in 2017, replacing the Wii U. Even though the Wii U was Nintendo's actual, real 8th generation console. So really, the Wii U, PS4, and Xbox One all should've been removed once the Switch came out, since the Switch is, by traditional definitions, the first 9th generation console. Yet we kept hearing debates about "Is the Switch 8th gen or 9th gen?"
If it's the latter, then in that case the Switch never belonged on that tab alongside the PS4/Xbox One and those two should've been booted to
"Last Generation" with 7th gen being tossed entirely as soon as the Switch came out and the Switch should've been by itself, even though the PS4 and Xbox One were still in the middle of their life cycles with the PS4 in the middle of its peak year.
If it's the former, then the Switch should be booted along with the PS4 and Xbox One now that the PS5 and XSXS are here since the Switch would also be considered old gen.
So which is it?
The archaic and dated conception of generations is exactly that, archaic and dated.
Hardware Comparison Threads:
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017