To be clear, I pass no judgement on any setup. At all. Use a smartphone. A single lens. A bag full of them. You do you.
I specifically objected to the weird comparison the author makes, the sense of superiority, the self-contradicting arguments.
Now I carry around a huge sony mirrorless with a big heavy 24-70 g master zoom.
One camera, one lens is fine - until you want to actually exert compositional control. You can't beat 70mm+ for portraits. You can get 75% there with one camera, one lens, but sometimes you gotta dive deeper.
(Also his setup is bigger/heavier/lower quality than the rx1/rx1r, even within the "one camera one lens" masochist arena.)