Thank you for confirming this. I wanted to be sure, because one or two of the recommended methods for other things listed on Administrative Bulk Operations had unwanted side effects the last time I used them.
I used one to move topics from one category to another but it moved the about topic along the regular topics. I might have used a rails script instead of the rake task though. I’m not sure. 
I also used the “move all topics with a specific tag to a single category” rake method, which didn’t populate properly some tags-related tables in the database.
edit: oh, it’s my Cake Day! If only the cake was real… But maybe it is though?