One member of the performance apparently posted up something about the "New Gay Testament", which was quickly taken down.
I wouldn't be basing the purpose of the performance on one over enthusiastic performer with a smartphone and social media account.
The actual event organiser has stated from here to Kingdom Come that the performance was a gay pride type deal based on the "Feast of the Gods" by Biljert. And then was compelled to apologise because of the outcry from upset American based business interests and sponsors.
This happens all the time. That lame POS Jack Black threw his mate and band partner of 30 years under the bus because his poorly thought out comment would = a huge drop in ticket sales to JB's next Kung Fu Jumaniji or the next stupid Panda movies he's doing.
That Biljert painting is all the gods on Mount Olympus partying on. You know, Greek Gods, the Olympics are from Greece, they're on Mount Olympus? And they can't help but throw in all the feel good fuzzies about Liberty/Equality/Fraternity from the French Revolution. Anyway, that's what it is.
The Last Supper by Da Vinci (gay himself) has ZERO to do with the Olympics. May as well have the Greek Gods partying in the manger where Jesus was born, or on top of an Egyptian pyramid. Makes zero sense.
If you live in a country where you feel that woke radicals are constantly attacking your conservative Christian values, then it's only natural that you're going to see this as yet another attack. The only thing in common with the Last Supper and that Olympics thing is a bunch of people sitting down on one side of a long table. You're going to have a long list of people to be upset with if you want to have a monopoly on people partying on around a long table.