Having 30,000 vaccinated people pack into a basketball game can't be accepted in good faith when countries are trying to ban unvaccinated people from air travel, working in offices, working in healthcare settings with proper precautions, etc. when vaccination isn't a switch for forever lasting 95% immunity.
Hopefully we can get to a point where a vaccine or something else can put an end to this, but until then telling a large group with variable levels of protection that are they safe is enabling the spread of the virus.
The article’s conclusion was “It appears to be grossly negligent to ignore the vaccinated population as a possible and relevant source of transmission when deciding about public health control measures.”.
If anything, waning vaccine protection is an argument for that conclusion.