There are numerous theories for interstellar travel involving use of other dimensions.
The various string theories require extra dimensions we cannot sense above the “normal” four, with the most popular right now positing 11.
It is not utterly unreasonable to assume an advanced civilization could exit normal space in their star system and re-enter it in ours, without passing through the intervening normal space, in much shorter time or possibly even instantaneously.
Do we have a clue how to do this or even if it’s possible? Nope. But we also cannot say it is impossible.
The laws of time and space are relative in the sense that they work differently in different parts of the universe. The Vedas explain this.