As per What are "Community Wiki" posts? does the initial edit make from the author count as edit? Does it count when checking if the author of the post edited the post at least 10 times?
According to an answer from Anna Lear on another meta site, the original post did not count.
However, since this question was asked, automatic conversion to community-wiki status based on the number of edits (or editors) has been turned off. Posts now only become community wiki by explicit action.