This question has been in Meta to discuss whether it's a fit or not for well over a week, without response, so I will just post it and see what happens and change it if someone feels it's not a good fit for the QA format
Unmasked spoilers ahead
This question doesn't make any sense without knowing the movie, so I didn't mask spoilers, as it would render the whole thing useless.
During Arrival we learn that there is a sort of magical (for lack of a better word) writing system that, when learned fully, allows you to perceive time in all directions, as a whole.
The more Louise learns of the language of the aliens, the more she can travel or rather experience time and draw conclusions from events that have not happened yet to change her behaviour in the past.
This revelation leads us to wonder whether all that will happen has already happened (in the sense of inevitability, or fixed fate)
My interpretation is such that because Louise experiences Past, Present and Future (or rather; lack thereof) simultaneously, the audience is lead to believe that her future has already happened.
It appears as if she can experience all of her time at once. By that logic it would also mean that her mind is more or less "outside" of time, making her mind immortal (because she can jump indefinitely inside her timeline and relive it all again).
And; If that was true, it would mean that by knowing the universal language gifted by the Heptapods, you will become immortal, as you will be able to experience your life all at once - basically jumping in time to wherever you want.
Did the writers intend the implication that time is a closed loop or is did I miss a clue in the movie where it is explained how timelines work in this universe?
Is there any canon description of how this rendition of time travel should be interpreted in the book or by the screenwriter, director, etc.?