I'm very confused by how this occurred. Did the school implement a policy that it's okay to send out AI generated emails so long as the use of AI is disclosed?

I'm very confused by how this occurred. Did the school implement a policy that it's okay to send out AI generated emails so long as the use of AI is disclosed? Did the sender not proofread the email and notice that it mentioned ChatGPT at the bottom? What other emails are being sent out without a human so much as bothering to look at them?