First of all.... Trump's comment was not in response to the question by pressholes "Will you accept the results of the election?", as you seem to have insinuated.
Trump was addressing his supporters, encouraging them to get out and vote.... because yes, there WILL be rampant voter and election fraud (already is, in fact) being committed by the leftist DemocRats. It's what they do. So taken out of context, what you're alluding to may not be a complete lie.... but it sure as hell is deceitful, still.
And from the NYSlimes article, the lie is repeated....
"...he repeatedly suggested that he won’t accept the results of the election, should he lose."
And that is NOT what Trump has said. But since when does truth, facts and reality matter to the lying radical left. They would rather lie than tell the truth, because the truth is anathema to them.