Thread:BEJT/@comment-27724978-20190729170315/@comment-26838855-20190729171130

Loki taking the Tesseract is already in an alternate timeline.

According to the Russos, that action however would make the timeline unable to be "rectified", leaving it a mess. The Russos seem to imply that timelines don't in fact get erased, just fixed as much as possible.

According to Markus and McFeely, the timelines are all to do with removing/returning Infinity Stones and they believe that timeline, as the film implies, would get erased by Steve.

The show being about this Loki would imply Marvel are leaning the Russos' way and fudging the rules of the film for creative purposes. However, it's possible that, seeing as the Jaws image and previous rumours would suggest Loki will time-travel, Loki escaoes that splinter timeline before it's erased.