They didn’t get a lot of data from the original probe, and it’s proximity to a black hole warped time so they couldn’t get close enough to survey the planet before landing, as time was warped as they got closer to the planet and the plan was to quickly go in and out so their mission wouldn’t be prohibitively long on Earth time.
Every hour they were close would be seven years on Earth.
Every movie with light speed travel gets the dilation of time wrong. And there is no way to go 'back' in time.
But a big problem is that the wormhole that allowed the current Humans to 'get out' was built by Humans who got out.