No one knows the herd immunity threshold for these vaccines. Based on cases of vaccinated people getting Covid infections, this is just the vaccine preventing serious infections.
Your link doesn't contradict anything I said so I'm not sure why you are claiming it's "misinformation".
A 90% reduction of infection means vaccinated individuals still get infected. That's what other countries have seen as seen.[1]
300 unvaccinated COVID-19 cases in current Singapore outbreak vs 78 vaccinated
If vaccinated people still get infected (even asymptomatically or at a lower rate) then they can transmit to the unvaccinated. There is no sterilizing immunity therefore the herd immunity threshold is likely much higher than 75%. Basically if you aren't vaccinated, you aren't protected.
