I guess they are laughing it off because it was another Allianz sponsored stadium depicted, and they got the OK from Allianz to make the joke as it is free attention.
If the AI design had chosen a non-Allianz branded location I bet the response would be different.
The race has nothing to do with the stadium, other than running past it. They don’t have to get permission from anyone. Also, there’s no evidence that AI was involved, it could have just as easily been some designer googling for “Allianz Stadium” and illustrating the first thing that came up.