How to disable touchpad in 20.03?

The documentation of services.xserver.libinput.additionalOptions says:

         Additional options for libinput touchpad driver. See
         libinput(4) for available options.";

So I set it to additionalOptions = ''Option "Ignore" "on" ''; to disable the touchpad. However, in 20.03 this doesn’t seem to affect anything, probably due to #72774. Is there a way to disable the touchpad while keeping the trackpoint enabled?

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