This answer seems to be converted to a comment, since the user does not have enough reputation to comment on his own.
The question would be is why wasn't the answer removed?
The user simply posted his reply as answer and as comment.
You can see that there is a time difference (6 minutes, comment posted first) on both posts which indicates that it was not automcatically converted but manually posted.
And as @ShaWizDowArd noticed: These are even 2 different user accounts.