Well they are also playing "Erika" which is a right wing dog whistle, though maybe not as uncommon in these circles, as outright Nazi salutes
Edit: Also curiously most people, myself included, never find themselves in danger of accidentally heil hitlering even when blackout drunk. Seems to become a more common occurrence in Saxony though.
Did we watch the same video? In the Twitter thread I saw the lady right in front was doing multiple Nazi salutes in a row, very excited about the song. Don't think there's any ambiguity what she was doing