Correct. (Of course it's possible that someone downvoted those comments and then removed the downvotes later.)

The way LW displays votes is a bit strange. From the points total and the %positive, you can deduce the numbers of up and down votes in all cases except for "0 points, 50% positive", from which you can tell only that there were some positive number of upvotes and the same number of downvotes. (Well ... if the numbers are really large then the rounding-to-integer of the percentages gets in the way a little.)

I think that given (1) the usually-small number of total votes and (2) the generally high level of numeracy of the LW readership, the only disadvantage to changing from "1 point, 67% positive" to "+2 -1" is that it would require someone actually to make the change, and there are very few Round Tuits[1] available for that task.

[1] "Oh yes, that's a good idea. I'll do it when I get a round tuit." I have seen shops selling Round Tuits. Unfortunately they don't actually generate increased motivation or spare time.