That was smart of you. If someone is hurt or killed, your intentional silence over an issue you know to be a safety issue might put you in a bad place legally. Especially considering you maintain a collection of Teslas that aren't updated- f one of those owners or their families is harmed by a defect you were aware of beforehand things might not go well for anyone involved. On the other hand, if you downgrade your customers they won't enjoy paying you for the pleasure. It's a tough spot for you.
I know you're extremely sensitive to avoiding any court problems, so weigh everything against the legal ramifications keeping the secret. Others are willing to do everything for you, you don't need to assume any responsibility. You can continue to act surprised when the fires keep happening, but maybe doing something with what you know can reduce the chances of any of them ending tragically. There is a legal meeting between Tesla and DJRas' lawyers right now that would benefit from your information. It is currently private and sealed. Submit your information to them and they will show it to the court without this continuing to escalate.
I know you're extremely sensitive to avoiding any court problems, so weigh everything against the legal ramifications keeping the secret. Others are willing to do everything for you, you don't need to assume any responsibility. You can continue to act surprised when the fires keep happening, but maybe doing something with what you know can reduce the chances of any of them ending tragically. There is a legal meeting between Tesla and DJRas' lawyers right now that would benefit from your information. It is currently private and sealed. Submit your information to them and they will show it to the court without this continuing to escalate.