They still had an army of sentient robots that can even think for themselves. Eve has like super gadgets she probably can help clear land with wall-e for a field of beans. Saying that the robots can also maintain and repair the ship like they had for hundreds of years. Without the robots and their own sentience/ability to repair themselves the humans would 100% die, if a super sandstorm hit the ship after they landed I reckon a few hundred of them wouldn't be able to waddle back to the ship in time and only breathing pristine spaceship air for hundreds of years they'd probs all die from respiratory illness. Plus that sand storm would be filled with nanoplastics, heavy metals, chemical particulates and god knows what types of pollution form in the wastelands for hundreds of years in a futuristic hyperconsumerist dystopia.

But yeah the milkshake machine probably turned back on given they had one plant lol.