That was just a euphemism, not to be taken seriously. In Vanilla SSF4 they tried putting every character into the middle ground, and the majority of the charge characters came out on top. With AE they're "purposely making certain characters strong and others weak".
Short version: Ono's version of unbalanced = balanced in our non-troll language.
EDIT: More balance changes for Zangief, Dan, Dudley, and Sagat.
http://www.eventhubs.com/news/2010/nov/29/ssf4-dev-blog-ae-changes-zangief-sagat-dan-dudley/
And Arcadia released a partial list of changes to other characters. These go in tandem with the above.
http://www.eventhubs.com/news/2010/nov/29/list-changes-ssf4-arcade-edition-arcadia-magazine/