Ummm
OK I respect your view but from the website you cited:
When standard thermostats fail, they lock in the closed position and prevent coolant flow to the engine, which can potentially cause serious damage to your engine.
From the very first Google result:
As the engine temperature rises, the wax expands and steadily pushes on a rod that opens the thermostat, allowing coolant to flow. When the engine temperature drops, the wax begins to harden, and the thermostat starts to close.
i.e. the Wax pushes against the spring which closes the thermostat. That makes sense to me given that the wax expands as it gets hot.
C