I've heard of using multiple exclamation points for dramatic emphasis or using an exclamation point and a question mark to denote a question being asked exasperatingly, but a comma followed immediately by a period? Those two, much like drinking and driving, should never go together.
My theory is that the original NFL blurb was lengthier, but in an effort to edit for space, an editor trimmed some fat, so to speak. In his quest to fit this blurb into its allocated spot, however, he failed to delete the comma. That gives me the urge to throw a host of punctuation marks and other symbols together. *&#%@!