They did then go on to get nearly 2000 "very positive" reviews, which is indicative of many more sales. I think they did well in a sale later down the line.
Slightly directed at a sibling comment, but yes indie games (can) make a significant amount of revenue through non-release sales, even at heavy discounts. For example, Dustforce more than doubled its cumulative revenue through a 50% steam sale and inclusion in a Humble Bundle: http://hitboxteam.com/dustforce-sales-figures
I'm pretty sure the way this works nowadays if that your launch bombs you throw your game into as many bundles/deals as possible so I'm guessing those sales are at 5-10% of the original MSRP at best.
