I've just said that given I've taken it from John Curtice you take it up with him.
If you repeat a claim (that is wrong) you own the wrongness just as much as the individual who may have made it in the first place.
Hence I take it up with you, as I've no interest, nor any way, of taking it up with Curtice.
You could, of course, just accept that you are wrong NS.
At no point have I said I couldn't be wrong.
It isn't just that you could be wrong, you are wrong NS. And saying that you haven't said that you could be wrong is a world away from actually admitting that you are wrong (which of course you are).