I think you could've worded that better, but even then, it doesn't make a whole lot of sense, since you don't exist before you're born, so "negative lifespan" is a weird thing to say.
But fun fact, genetically female babies develop all their egg cells while still inside the womb, so at some point the egg cell that became you was inside your grandma.
I only tested it for a couple of minutes and my understanding is that it's just a cosmetic change to make Wefwef/Voyager look more in line with the native UI of Android.
You're flipping it in 2 dimensions, the trick is to do it in 5!