The key word here is "unwittingly". The MC is actively CHOOSING to help out. So no, not a cuck.
Did you even read the screenshot you posted? Or are your reading comprehension skills really that poor??
IF that was somehow true, then you have just destroyed the intended meaning of the term for all those ppl who consider cucking to be a pleasurable kink. all those millions of swingers out there arent really enjoying it unless its rape, right, you fucking moron?
really dear, do try to keep up with the rest of society.