I have never said that. That is just your reconstruction.
There is Decision Theory. It outputs optimal action through evaluation of strategies, of contexts, of principles. In order to properly get the strategies, the contexts, the principles, you need that skill that approximates ideas to truth - and such skill is named Intelligence. Optimal action decided in light of principles within a well assessed context is ethical behaviour. Ethical behaviour hence requires Intelligence.
As written, «Ethical Calculus is a function of Intelligence - of course it is, it is a structure of assessments».
> possible to act morally without being intelligent
Random correct behaviour proves nothing. Of course one can guess the roll of a dice roughly every sixth event. If you behave "well" but do not know why that is "well", that is like guessing. "Good" behaviour without intellectual awareness is like memorizing arithmetic (multiplication tables) without knowing why those memorized notions are correct.
> possible to be intelligent without acting morally
No, because by definition that would be a fault in Intelligence. If your action was imperfect, suboptimal, it is because you could not think of a better action or understand that the other action was better. If two choices C1 and C2 can be ranked, there is a reason for their order; knowing and understanding that reason is the task of Intelligence.