If the battery is physically damaged causing a runaway, the car flashes a huge warning and beeps. But that isn’t caused by ordinary events like driving up a steep hill when it’s hot out. It’s caused by accidents that significantly damage the car.
Having a coolant temperature gauge in front of you could show you a trending problem, before the car announces to you that it is shutting down as you attempt to merge into 75 MPH traffic.
The Tesla club comment at the top of your link is about a Roadster, not a Model 3.