A big difference between scepticism and denialism is that sceptics can identify what evidence would persuade them and then change their position when they have it. Denialists will move the goalposts, acting as if the evidence has no consequences for their arguments. When dealing with denialists you have to constantly remind them of their own arguments otherwise they will simply move on.
The recent PIRLS results, that assessed reading in “4th grade” in 61 countries, and allowed for comparisons between countries and with previous scores was a perfect example of this. This was the first PIRLS cohort to have been through the phonics check. They indicated who was right and who was wrong in their predictions about the effects of the phonics check. The results showed that since the previous round of PIRLS, reading scores in England had improved (to their highest ever) with spectacular gains for the weakest readers.
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