On all the 2010 IMIEVs here in Australia with the original charger cord (no EVSE), The connector "Guns" have the trigger that connects the proximity pin to ground when the trigger is released. All of the EVSE and charging stations I've come across here in Australia also have the Trigger/latch. I once came across trying to use a LEAF EVSE on my IMIEV, and thought I had a faulty EVSE, but when I jiggled the gun it started working. I found the trigger assembly had a latch across the top of the connector that was a tiny bit wide and did not smoothly easily drop into the grove on the car connector. This was keeping the trigger from fully releasing and making the ground connection to the proximity pin. I filed down the plastic on the latch and coud then use the EVSE without issue.
They all have the trigger as it is also part of the mechanical latch that holds the plug in.
But try pressing the trigger while the car is charging to see if it stops the charging - with my Rolec charger it definitely continues to charge while the trigger is pressed and does not stop until the plug is physically removed.
I'd have to test it again to be 100% sure, but I think my OEM Yazaki charger that came with the car is the same.
Circuit diagrams typically show the trigger as having a switch connected but I don't think it was ever a mandatory part of the spec, and the pilot line uses a shorter pin that is designed to disconnect first when the plug is withdrawn, this causes the charging to stop cleanly before the AC lines are disconnected to prevent arcing etc.