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.
If you live by the sword, you die by the sword.