What does Tado "Thermostat off" actually mean

Not sure what “Off” means. I hoped it means closing the valve, but from looking at it I’m not certain. A flow of mine turns the Thermostat to “Off” once the window contact alert is “On”

The Tado app, tells me, it’s actually Off. Only frost protection is on. Seems the displayed status is a freeze of the last status, no?

Seems to work as expected, now back to plan