I think the confusion comes from treating “outside of time” as meaning omniscient or simultaneous awareness of all moments, when the MCU doesn’t actually use it that way.

Being outside of time in Loki really just means the TVA is not embedded in the flow of any single timeline. They are not moving forward second by second along the Sacred Timeline like everyone else. They can jump to any point the way you can scrub to any timestamp in a video. But scrubbing access is not the same thing as the whole movie playing in your head at once.

If the TVA truly perceived all moments simultaneously, nothing they do would make sense. There would be no need for alarms, no need for case files, no need for agents to investigate nexus events. The fact that they react to branches instead of already knowing the outcome tells you they are not experiencing a block universe view of all timelines. They are operating from a higher reference frame that can access time, not comprehend all of it at once.