Vital 1st Team Regular
If it really is as simple as changing the words from, "Arbeit macht frei", to, "Vaccines are safe path to freedom", then I really don't know what the fuss is about or why he's been arrested. He's making a political point, one that most people will reject, but a political point nevertheless. There doesn't appear to be any hate speech there.
They could have used other images (e.g the "safe" Titanic), or cartoons of Nazi soldiers etc