Are you referring to the pixel-level font smoothing they use by default (as opposed to CMD's subpixel-level font smoothing)?

You need to define the "antialiasingMode" key in the settings JSON for the default profile to hold the value "cleartype", rather than "grayscale" (which is the default value). I don't believe this is exposed in the GUI settings page.

Note that this only affects the actual terminal emulation area. The rest of the application will still be pixel-level font smoothed (so e.g. the tab titlebars, the settings, etc.).