Didn't see this as I skimmed the article but: What happens when people return? The train lets off a bunch of people at once that need rides, but will there be enough uber drivers to meet the demand?
This town itself may not have a ton of Uber drivers, but they can come from anywhere in the area.
That said, the town is 6 square miles and they're not getting rid of the existing lot. If you're close enough to the station, why not just walk?
It's not that there isn't a potential pool of drivers who are fine with working a few hours a day but it's not obvious.