Or, the TVA is full of shit. We'll find out their real purpose in the next few episodes. My guess is a better understanding of timelines and the MCU multi-verse, and why they seem to be pruning other multi-verses rather than "upholding the sacred time line" as they claim, is coming.
Like I said before, a sacred timeline implies one timeline above all else, and preventing it from diverging into other timelines from variants through paradoxes / time travel shenanigans.
Other timelines don't exist, because they "lost the war" and were destroyed (supposedly) by the time keepers. So the TVA states their goal is to keep the sacred, last timeline from branching and recreating the original multi-verse problem of timelines vying for supremacy.
But, you don't let the universe randomly bubble up a heroic, good female Loki and prune her 10 years after the event that created her. She's literally from a different timeline and was allowed to exist until an event that made her a threat to the TVA's machinations. All those radically different Loki variants are, just the act of letting them live for thousands of years would create wildly divergent timelines, which we know would be way past the red line.
So it seems to me alternative universes were not destroyed, they're just being managed by the actors of the TVA, just as time is managed in our timeline by the TVA.
That's a multiverse that's still active, and at conflict with whoever is controlling the TVA. They're killing off multiverse threats, not just fixing timelines, all the while claiming theirs is sacred, because they can.
IE they're full of shit.
