Read my post again. I never made that assertion.
I stand corrected. What you said was "I've been here nineteen years and I can't think of another time I told a poster that their article was a duplicate."
So in other words you are admitting that you have been unobservant for nineteen years or your memory is beginning to fail. If the former you could pay more attention before making assertions. If the latter you might want to get that checked. It could be early symptoms of Alzheimer's.
Or you could be negatively influenced mentally by the son of former emperor Mario and his associated evil.