I mean, I agree with you that Elon is typically full of shit, but it's FUD because it's not a problem in real life, the bluetooth isn't always reliable in the general case anyway, anyone who relies on the car in a practical sense understands that the key-card is the key, not the phone.
Every outage is a "real problem", I'm using a turn of phrase to express that it's not at all a big deal. Instead of the car magically unlocking and starting from your mere presence you must deign to reach for the physical key like some type of barbarian.