In porn/fetish/fantasy context, you're not wrong.
In all other contexts and usage of the word, you're wrong.
Modern usage (in the fetish context) prefers to reduce the stigma of an unfaithful wife by distinguishing using other terms like stag/vixen, hotwife, swinging, sharing, while generally leaving the "cuckold" term to apply to a submissive, instances involving humiliation, or a guy who likes the fact his wife cheats on him.
Thus, the humor in the chain of comments... You're still a cuckold (in reality), but if you call it hotwife, swinging, sharing, etc. you can fell less of a pussy about your wife/SO being unfaithful...