Yes Dragstrut that is correct. But the ground spoiler function is based on thrust lever position.
Full extension - Landing phase
If the ground spoilers are armed and all thrust levers are at idle, the ground spoilers will automatically extend as soon as both main landing gears have touched down.
If the ground spoilers are not armed and both main landing gears have touched down, the ground spoilers will automatically extend as soon as reverse is selected on one engine (the other thrust lever remains at idle).
Note : The spoiler roll function is inhibited when spoilers are used for the ground spoiler function.
Partial extension
The ground spoilers partially extend (10°) when reverse is selected on at least one engine (other engine at idle), and one main landing gear strut is compressed. This partial extension, by decreasing the lift, eases the compression of the second main landing gear strut, and consequently leads to full ground spoiler extension.
Retraction
The ground spoilers retract :
After landing, or after a rejected takeoff, when the ground spoilers are disarmed.
Note : If ground spoilers are not armed, they extend at the reverse selection and retract when idle is selected.
During a touch and go, when at least one thrust lever is advanced above 20°.
Note : After an aircraft bounce, the ground spoilers remain extended with the thrust levers at idle.
FOR INFO
The landing gear touchdown condition is triggered for both main landing gear, either when their wheel speed is greater than 72 knots, or when their landing gear struts are, confirmed to be compressed by the radio altitude (RA < 6 feet).
The thrust levers are considered to be at idle when they are :
Below 4°, when the RA is above 10 feet,
Below 15°, when the RA is below 10 feet.
Thus although thrust will be at idle the logic will not. Try it in the sim if you have a chance!