as we know it is a lie. For example - everything about the Sacred Timeline itself doesn't really make sense. If there is one "Sacred Timeline" which was woven together by the Time Keepers, then how can there be multiple Lokis that were on the "correct path" for the Sacred Timeline before their nexus events? For example, how was there a female Loki who was good in her version of the Sacred Timeline until her nexus event which got her arrested by the TVA? That means there were already multiple branches before anything was pruned or reset.

I don't want to get into speculation because that brings disappointment, but everything they've shown so far indicates that the person behind the curtain is Kang the Conqueror - Alioth in the comics was essentially the guard dog outside the barrier of Kang's domain, which was exactly what we saw in the last episode. Ravonna Renslayer and Kang were in love with each other in the comics. Stark Tower in the last episode had QENG on it instead of STARK, and the CEO of Qeng Enterprises in the comics was Nathaniel Richards - Kang.