Well if that’s true the sutta would have a correct interpretation in my opinion.
However I looked up the definition of counterpart
COUNTERPART | English meaning – Cambridge Dictionary
and it says
“a person or thing that has the same purpose as another one in a different place or organization”
So if it literally meant counterpart, wouldn’t that mean that sukha is a direct cause of dukkha?
I think the problem is that in Pali the compound word is counter-part but not the counterpart as a single word as in English.