It's a Keychron Q10 Max (Alice Layout) - looks like a split keyboard but it's one piece. It's excellent typing, has both wired (USB-C) and wireless (Bluetooth, probably also radio too? I don't use that) connectivity too. I don't normally use the LED lights, but occasionally they are fun...
It's heavy, so not portable like the one the author uses. Had something like that before, the portability was nice, but then didn't use it much. This is not (practically) portable, but still has all the flexibility, and it's a joy typing with it. I wouldn't go as far as I love a piece of euqipment, but I do look forward using it every day.
I do think more about keyboards as I use Mac, Linux, built in laptop keyboards, this stand alone one, etc... And because of the variety it's really hard to build up some muscle-memory. Ctrl, Option, Alt, Fn, ... basically all the extra keys beside the alphabet are slightly different in all systems. So it's more conscious typing than I'd hope for, but not toooooo bad (and it's not the keyboard's problem, I might have to look into remapping stuff, but it's not that level of pain yet).
Happy typing, everyone!