I don't see why not. I mean, that guy is "Anonymous" and only 3 upvotes and he's ranking at the top amongs 10s of other answers.
I believe, as long as your answer is long enough and genuine on the site (even though you can copy paste materials which happens alot, and it passes their system check which is funny), they won't suspect a single thing, and then casually link out like a blogpost. Also, as long as the community answering the question in particular isn't very "active", chances of being reported is pretty low.
Furthermore, quora's community is not as smart as reddit. Or to put it bluntly, they are really dumb.