This is the new area of research: timelines, both past and future, and let’s include present in there as well.
Perhaps part of the answer lies in what Betty Andreasson told to the MUFON investigators while she was in hypnotic trance in 1977: That, to these beings –whatever they are, wherever they come from– “the future and the past are the same as today.”
https://mysteriousuniverse.org/2020/04/strange-happenings-during-filming-of-ufo-documentary/