I'm pretty sure the anon who asked about Aradia going god-tier even though she was already dead meant how did her dream self get to the slab in the first place. Unlike the other players who's Sacrificial Slab's were on their planets, hers was located on Derse, so when Jack destroyed it it caused her to die while on the slab, thus ascending her to god-tier

Quest Beds/Cocoons are located on the player’s planets.  Sacrificial Slabs are usually located in the center of Derse and Prospit’s moons.

Aradia’s was an exception and hers was in the center of Derse and her dreamself was placed on it since she died before the game started.