If you're seriously trying to explain this show by using the timetravel from endgame you haven't been paying attention to the show at all and are very stupid, almost as much as the bullshit explanation that they used in endgame.
why are u all trying to apply endgame time travel rules to this? News flash: endgame is not the best source to go when talking about timetravel (its actually a shit source, forget marvel a little, please)
In this world u cant create a new timeline just like that. U also cant change big things about the timeline, only small things. If u try to change big things, it wont work, like Ulrich trying to kill young Helge and Helge seemingly coming back to life.