Check this data in a few weeks. https://covid.cdc.gov/covid-data-tracker/#rates-by-vaccine-s...
Note also that this data is as of October 2021, so it's primarily looking at the efficacy against the Delta, whereas the original 90-whatever % claims were obviously the original virus.
Pfizer et al certainly weren't saying in March 2021 that "Pfizer provide 90-100% protection against COVID and all future variants" and I've never heard anyone suggest they thought that's what the claim was.
Omicron is going to make it worse, but even unboosted folks in South Africa seem to enjoy about 30% efficacy against infection and much higher efficacy against hospitalization and death. But your gossip trumps the data, I guess...
But you say "has proven less than 10% effective" ... because you are making stuff up.
Further, it may be a mistake to assume South Africa predicts exactly what will happen here (30% fully vaccinated, nearly 0 boosted, 20% HIV incidence, vs. 60% fully vaccinated, 25% boosted, 0.3% HIV incidence).