"I didn't get the document, why don't you look it over one more time and send it by mail?" is usually a polite way to say "please reconsider what you sent me." Sometimes, people will say the second one off the record. Given that he has responded to ethics complaints by email before, Nick Rekieta has almost certainly heard "We didn't get the documents, please send us a serious response in the mail" and didn't realize what that actually meant.
It could also be a hint that he really should hire a lawyer for his ethics issue because this one is serious, in the sense of "no, I didn't get your lawyer's response to the complaint."
Of course, Nick Rekieta has never heard of subtlety or subtext at any time in his life, so there is no way he would understand this.