If someone wants to say they are a moral realist but not a cognitivist then I have no idea what they are because they’re not using standard terminology.
Presumably a Platonist who thinks the Form of the Good is revealed by a mystical insight.
A Platonist who thinks the Form of the Good is revealed by mystical insight is a cognitivist and I don’t know why you would think otherwise. Wikipedia:) “Cognitivism is the meta-ethical view that ethical sentences express propositions and can therefore be true or false”.
Or you’re not using standard terminology, in which case, see above.
Presumably a Platonist who thinks the Form of the Good is revealed by a mystical insight.
A Platonist who thinks the Form of the Good is revealed by mystical insight is a cognitivist and I don’t know why you would think otherwise. Wikipedia:) “Cognitivism is the meta-ethical view that ethical sentences express propositions and can therefore be true or false”.
Or you’re not using standard terminology, in which case, see above.