Wow, please report that account to @steemcleaners, that's clearly automated spam: http://steemcleaners.com/reports/new
The dust limit has no influence here. The votes are big enough that they easily exceed the HF19 and the HF20 dust vote limits. What is there already is the bandwidth limit. If you look up that account on steemd now, you'll see that it actually ran out of bandwidth right now and is currently not able to post:

However, as you can see in the authors posting history, it doesn't really prevent that kind of content...