From the article:
... Vance is skeptical that Apple doesn’t have a secret backdoor. “They get into my phone all the time because they upgrade my operating systems and they send me messages,” he says.
I do not expect the Manhattan DA to have more than a superficial understanding of technology, but after a statement like that it is fair to expect him to be corrected, educated, and the article to call out "that's not how any of this works"