Astronomer here! “The false vacuum thing” is a scientific hypothesis that our universe is actually in a false phase state as part of a larger universe, like if it were in a temporary thing (think the real universe is a pot of boiling water, and we are just within a bubble forming at the bottom of the pot). Eventually however that false vacuum has to pop- yes, even after billions of years in this false state!- and we and everything we know in our visible universe will disappear in an instant with no warning whatsoever and there's nothing you can do about it.

Sweet dreams!