You are exactly right and help making my point for me. From a brief look at the article you cited. "For every 5 weeks that passed since a person’s last vaccine dose, the risk of transmitting the infection to a close contact increased by 6%."
But immunity against severe infection does not wane to the same extent. It's impossible to vax away transmission risk. Even your cherry picked study topped out at 21%.
As for your last comment, you should probably stop listening to grifters like Feigl-Ding and other COVID alarmists. I have not seen anything remotely suggesting that a new wave should result in mass hospitalizations and death considering population wide antibody levels + paxlovid. Is it possible with a new variant that is immune evasive? Sure, but in that case, inherently, a vax isn't movign the needle by definition.
Now, could a bad flu season combined with slight uptick with Severe Covid be bad? Sure. But if I'm a betting man there is more population wide risk from the flu this year than Covid (and turning Covid into the flu was always pretty much the goal in 2020).