As I said I don't much recall the original movie but I think I can see how this movie could work as a sort-of prequel to it, at least in part. I don't recall much detail in the original movie of it being to explicitly stated they were on a FTL mission to an etra-solar location. And if it did, clearly this movie wants us to think that's what the shuttle launch/loss was and that this is what happened in this series of movies.
In PotA, Taylor tells Dr. Zaius that he's from a different planet in another solar system. In the beginning of the film, he talks about the ship travelling nearly at the speed of light, and how 600 years have already gone by back on Earth. When the three of them are walking through the desert, they speculate about which star it is overhead.
The evidence of it being a star-flight are pretty clear.
The original PotA was used here as a source of inspiration, not a distant point to line up with.