No one has claimed that, except for a handful of long-dead sci-fi authors and people unfamiliar with the subject.
Interdimensional has been the foregone conclusion (rightly or wrongly) for a very long time.
What's amusing is how some people trot out that "billions of light years away" strawman on almost every thread of this subject.
“What’s amusing is how some people trot out that “billions of light years away” strawman on almost every thread of this subject.”
Because they view the concept through the lens of our own limited knowledge. It is antiquated thinking that it takes months to send a letter to the other side of the world when it can now be done in a couple seconds by email.
It is time to realize man is not the smartest entity in this game...