I wonder whether they changed the database. In the datadump the necessary fields are not available. There is a field for ‘score’ but not a field for upvotes or downvotes.
I believe that the datadump gives a good picture of their actual database tables and scheme. I would find it weird when they censored those columns from the dump. They actually do censor some other columns (like who voted) but then the dump has an empty column and they do not seem to remove the columns.
Interesting detail about the data-dumps is that they are still published with a reference to the CC BY-SA 3.0 license (the dump that is available on the https://data.stackexchange.com/ site).