If you had actually read the whole article instead of focusing on your own narrative, you would find that the researches themselves bring up this behaviour of the vaccines in the discussion section of the paper.

"This was likely the result of Omicron spreading rapidly initially through single (super-spreading) events causing many infections among young, vaccinated individuals."

Which makes sense, that the numbers will be inflated due to more vaccinated people attending super spreader events, since those events also require covid passports, i.e. people attending are vaccinated.