Tesla has not always had a demonstrated track history of updating their sites and pushing updated location information to cars in a timely fashion. There have been many superchargers over the years where I've learned about them first on this message board, and in at least one case actually actually charged at a location before it was shown in my car as being active.
Tesla may be doing this much better now, but that's the reason some find these types of posts helpful.
Your mileage may vary. Enjoy your car(s).