Portable Generator open ground

I wouldn't bet my life on it being 100% correct, but the specs in the manual say 120 volt only, and the wiring diagram shows the 3 receptacles in parallel, and unbonded. The manual unfortunately does not contain the words "neutral" or "bond(ed)", and "ground" is used only with respect to earth ground. Even with brands like Honda, the specs in the manual differ from the advertised specs (e.g. advertising gives power rating in watts, the manual gives it in VA).