I just when back and checked, it's a png of blurred text so it isn't really cloaking. Google presumably can't see that text but it gets indexed from the question, the first answer and the first words of the other answers though. Either way it's a page that's mostly useless getting indexed. Are the results higher because Google thinks a series of images surrounded by relevant text probably have relevant content? Are the results higher from the days when they didn't blur and got a half decent page rank (all those links still pointing at them)? I think Google recalculates fairly frequently, and I personally haven't seen as much Quora in my searches - but it's hard to escape personalisation see the DuckDuckGo experiment - so maybe they are on the decline. That's another argument against them being a one billion dollar company though.
So it's not cloaking, it's just bad and annoying.