False.How is that?
The hottest water would be on the outlet, not the inlet.
The Expanding-Wax-Pellet on the under-side of the Thermostat is
the mechanism used to cause the Thermostat to open.
Therefore, the "back-side" or "bottom" of the Thermostat must have
a steady circulating flow Coolant passing it at all times.
When the Wax-Pellet expands from increasing temperatures,
Coolant is then allowed to flow through the Radiator.
When the Thermostat is "closed", a separate path must be provided for
continuous Coolant circulation throughout the Engine.
Continuous Coolant circulation is required to maintain
even Coolant temperatures in all of the various parts of the Engine,
at all times.
The Thermostat only regulates Coolant flow through the Radiator,
it does NOT regulate Coolant flow through the Engine.
Coolant flow is constant/continuous in the Engine Block and Head(s).
Coolant flow through the Radiator is intermittent or "cyclic".