the dialog is purposely built to trick users into clicking on the X, something users have been taught to do and what has always by default been, "cancel, don't do whatever this dialog box tried asking you to do."
also, when is the last time you saw a dialog box with that much text? which dialog boxes have you been reading exactly? even so, it's not as though the amount of text telling the user absolves them from their dark design patterns to trick users. microsoft did the bare minimum to let users know and changed the way the ui works by having the close button _agree_ to the changes rather than canceling them.