Is there any other “cannot undo” vaccine? Everything I know has a lifespan. I think this is referring to the mRNA technology?

The truth will come out sooner or later and those that promoted or even mandate these unproved injections will face justice aswell , Focus on our Lord and Saviour Jesus Christ ,not on those that sold their souls

Simple. Once you've been injected with a vaccine, you're stuck with it and all that follows.