Well the passivization is corrosion. Stainless steel is covered by rusted chromium, which prevents further rust. If you scratch it, you should get another layer

Well the passivization is corrosion. Stainless steel is covered by rusted chromium, which prevents further rust. If you scratch it, you should get another layer of passivization. They Cybertruck's problem (oversimplifying here, there's a bit more chemistry going on) is that it has too low of a chromium content (as a cost cutting measure). There isn't enough chromium to protect the underlying steel from the conditions it's being exposed to. Or, to put it another way, the steel is corroding faster than the chromium rust/passivization layer can form.