I'm not sure I trust that wikipedia entry for the answer. There is almost no biographic data (not even a birthday) and the link which is supposed to be for Yoshimizu-sensei's personal site is not. (The artwork is not up to Yoshimizu's standards and the only Lucky Star link is to a doujinshi.)
My guess is the use of the male pronoun in the wiki is because most English writers insist on using gender specific pronouns and use male pronouns by default. Without seeing a picture or the kanji Yoshimizu uses for Kagami, I'm withholding judgment on Yoshimizu's gender.
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