Correct. There is an altitude limit for the VPS. The OP was flying under that limit apparently, therefore VPS is active. A data file would confirm that.
I saw that but your interpretation is incorrect. If you read that it say "When GPS is Unavailable" This means that the aircraft only uses the vision system for positioning. VPS is always active, unless you disable it....
when you fly outside and you get the home point message and take off the GPS and vision sensors are both working but as you fly higher then it is only GPS that keeps the drone on station, if you fly close to the ground then the vision sensors and GPS work together to keep the drone on station the only time the drone relies solely on the vision sensors is if GPS is not available,and then only to a height of 18ft
I would have echoed exactly the same as you two ... but that was before I read "When GPS is unavailable, the Downward Vision System is enabled ..."
What made me wonder was that it nowhere (perhaps I miss it though) is written that they work together at the same time ... if the altitude is low enough for VPS.
A read out from a log would be perfect ... that should make everything crystal clear.