For John, BLUF: Parents are a key factor in a child's education. Nothing to see here; just move along.
This has to be made up, doesn't it?
At least they have an answering Machine Message. Some people I know have never updated their message from the factory standard.
In fact, regarding the message, which you may have already clicked on, it is a prank. The prank reputedly started in Pacific Palisades Charter High School (California). It never went from paper to Voice Mail, but it represented the frustration of teachers with parents who were not doing their part.♠
Regards — Cliff
♠ The source of the debunking uses terms like "inflammatory" and "insulting". I think those are over the top and represent an ostrich-like approach to a serious social issue.