The decision makes no mention whatsoever of the app saying parking was free at a time when when it wasn't, which I think is a very important point that the adjudicator ought to have ruled on. Fundamentally, the council can't trick people into not paying by saying it's free, and then issue a PCN.
If the view count on the video is still zero then neither the adjudicator or the council has viewed crucial evidence that shows they did this, which I believe meets the (rather high) bar for asking for a review of the adjudicator's decision.
A carefully crafted request for a review on the grounds that the adjudicator erred in law by dismissing the video as "irrelevant or unnecessary evidence" without viewing it, when in fact it proves the argument made for promissory estoppel (that's legalese for going back on a promise) might work, especially if all you ask the Chief Adjudicator to do is to very narrowly consider and rule on the single unadressed issue of the video demonstrating promisory estoppel. Arguing that the interests of justice cannot have been served if someone presents evidence they claim proves their innocence and both council and adjudicator dismiss that evidence it without even looking at seems a strong grounds for review to me, and I think the Chief Adjudicator would have a hard time justifying a response of 'I'm going to dismiss it without looking at it too'.