Two years ago, sodium-ion battery pioneer Natron Energy was busy preparing its specially formulated sodium batteries for mass production. The company slipped a little past its 2023 kickoff plans, but it didn't fall too far behind as far as mass battery production goes. It officially commenced…
Sodium batteries are already in electric cars many months ago
https://www.engadget.com/the-first-ev-with-a-lithium-free-sodium-battery-hits-the-road-in-january-214828536.html
Also you could buy individual cells on AliExpress
https://www.youtube.com/watch?v=s6zcI1GrkK4
I don’t think the article was trying to imply that they weren’t already in use in electric cars, just that they would be better for them.