DonHolgo is right, they are playing with the German grammar, but not to make fun of German grammar, but to convey a message. They are against neoliberalism and capitalism and want to express this with their art. The (un)grammatical future tense becomes a metaphor for our precarious future beinhg destroyed by capitalism and neoliberalism. In an interview they explain it in detail: https://mephisto976.de/news/alles-wird-gut-gegangen-sein-werden-65542

Without "werden it's rather "everything will have went well". With it the sentence seems ungrammatical to me, where did you see it?