You don’t understand what people mean when they say that. The premise of everyone getting covid is based on the continued mutation and evolutionary pressure to more contagious and less deadly variants. The emergence of an Omicron-like variant is exactly what people meant when they said “everyone will get covid”.
Seasonal flu has r0 = 1.3. This means that it does not affect 75% of the population. The formula is p = 1 - (1/r0) to find out at what level of immunity the disease will die out.
Original Sars2 had r0 = 3, this meant that about 60% immunity level is needed. This is from where to original need of 70% of vaccinated comes from - vaccines do not give 100% immunity so you have to account for that.
Delta messed everything up. With p=85% and vaccine efficiency of 70% (because nobody, except Israelis dared to think about boosters first), you need more than 100% vaccinated - everyone gets is either vaccinated and lucky or vaccinated/unvaccinated and will get infected.
If you want the absolute safest option, then don't get the vaccine and take extreme precautions to avoid catching COVID. But that is unrealistic for the vast majority.