autoLogin appears in manual, but does not work

While trying to make autoLogin work, I saw the corresponding section in the NixOS 20.09 manual (see here). This didn’t work, nixos-rebuild switch tells me the option does not exist. However, doing, for example, ...sddm.autoLogin.enable = true; instead of just ...autoLogin.enable works.

Is this an error in the manual, or in the code? Or even an error at all?

Do you actually use 20.09? is not part of 20.03.

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Thanks for reminding me! Indeed I haven’t updated yet. Foolish of me…