@BadMayh3mFirstly, I'm not interested in whether he did or not. While the validity of Ronhaar's driving is still questioned and still not explained (Longuet couldn't close the gap with all the track extending, literally Ronhaar hovered around 1.1secs ahead of him while not using ERS), the fairness of a 5 sec penalty isn't the top of my list.
Secondly, watching the end of Ronhaar's steam, one of Ronhaar's engineers states that he recorded all of Ronhaar's footage when Ronhaar himself forgets to record it. This is mentioned as another person in his team says that PSGL need the footage ASAP while Ronhaar says he has 24 hours to provide it. So, it does sound like he had proof but PSGL thought the penalty was warranted if it was indeed provided by his engineer.
@ScarDuck14 @ There's a video around with streams of other drivers and their reactions. Benham's, Blakely's, Otis Lawrence's and some other streams all showed them laughing at Longuet racking up the penalty points to try and catch Ronhaar 😂 It made a mockery of the whole race. Weirdly Ronhaar's engineers never told him that Longuet was track extending but he stil kept the 1 sec delta for a large proportion of it, largely until the last lap when Ronhaar said he made a mistake. Maybe I missed it or it was said in Dutch? Guess it'll never be explained