I originally posted this on the other site back when I took the picture, and it resulted in a lot of confused comments, especially from Americans, eventually getting removed by overzealous mods. Either way, I promise you that this date does not exist, and has never existed.
When was the last time you spoke dates to anyone in ISO? If you don’t ever say the year before the month and day, then you intrinsically know ISO is not always the best format for the situation.
Spoken and written don’t need to use the same format. Time also isn’t spoken using the written format hhmmss.
So then we agree there is more than one correct date format.
It happens a few times a month, when dealing with something important to make sure people understand, same reason as to why I sometimes say times in a 24h format.