It was the "Contact Tesla Service" part of the warning that was unsettling.
The neurotic me started thinking: Where's that phone number? Are they open now?. Will their phone lines be jammed? Will they have to come out here to un-brick the car?
My car did the same thing the very first update that I received so I came to the forums and some owners said this was normal. I received my 2nd update on Friday evening and the message didn't reappear.