Could end up being an expensive typo if Diamond is part of the deal when the card is approved then they are stuck with it.

I would bet John from LoyaltyLobby checks that the email is authentic and there must be a hyperlink of some sort to lead to the application. I doubt these emails are being drafted by Hyatt since Chase as the card issuer bears ultimate responsibility. Even if it originates from a Hyatt Email address the author must be Chase.