What is your point?
That Zimmerman is asserting that he was given a Miranda
warning, that he understood the implications of it, and that he chose to make a voluntary statement. I'm guessing that's not something a defendant's attorney would recommend posting on the internet on the eve of pre-trial motions unless they were quite certain none of the statements would/could be challenged.
Certainly MOM has acknowledged that Zimmerman cooperated with police but this statement is a bit different in its specicifity and source.
All, of course, in my layperson opinion.