Yes from my understanding that is correct the measles and rubellaa vaxes confer long lasting sterilizing immunity . But there are still failures with the measles vaccine and there are still outbreaks even in the US. RNA upper respiratory viruses that have non human reservoirs generally arent amenable to vaxes that produce sterilizing immunity because they mutate into strains that are sufficiently different so as to evade the immune system. Once again dr Wen has it wrong. Covid is a completely different disease than measles or rubella.