If you read the article, it's because she has perfect memory recall, so they say it's as-if she can travel back in time, since she remembers everything vividly in great details perfectly.
Apparently the condition is called hyperthymesia.
Yeah buddy dude I read it. Thats just not possible.
I don't think it's a condition that is being debated much, it seems to have been pretty well studied, though it doesn't seem we really understand how it works or why it happens. At least based on the Wikipedia page.
The fact we have no clue how it works or why it happens just proves that they are plain lying
It isn't time travel, she has exceptional memory of her past.
Not actually possible though. Humans have constraints.