Earlier quoted context omitted.
Check your own biases. He was telling a huge crowd that the election was stolen, he would show proof the same day (we are still waiting), and they “will not stand down”. What else is needed to make that case? (non-US person here)
Like it or not, Trump is allowed to dispute the results of the election. He's also allowed to do so openly and to a crowd. Language like "will not stand down" is obviously in reference to the "fight" for his "case" and falls in line exactly with the language he had been using at previous rallies and on Twitter. Was he "inciting" a riot then? I hate that I even have to say this, because it seems childishly unnecessary…
But the president should have a moral obligation to only talk about actual fraud, not things he wants to have been fraud.
He spent months before the election saying how the postal votes were fraudulent, had his allies set the rules on counting so they would be counted later than other votes (in critical states) and then used that pattern of lots of "late votes" "appearing" as evidence of fraud - when in fact it was the entirely predictable consequences of how it was setup up.