Not a bad write up. And yes, I am correct, I don't know why there's so much doubt. It takes only one drive to listen to the gas engines behavior, but I also use a scan tool. OBD Fusion.When you mash the throttle, the drive-train computer(s) have to decide whether it is better to leave the ICE connected, contributing its torque at 2,000 rpm or so, or disconnect it, so that maximum electrical power can instead be fed to the traction motor, with the ICE revving up. RinconVTR says this is what happens (presumably by using his ears to hear the revving of the ICE, or perhaps he is using a code reader and app to actually monitor the ICE rpm). I don't doubt that he is correct in this. It may also be true that under less-than full-throttle acceleration, the computer(s) decide that it is sufficient to leave the ICE connected.
Direct Lock up clutch is only engages as "low load", and I described this clutch engagement/disengagement as "sensitive".
Honda's documentation indeed confirms, it activates at only at "high speed and low load".
Add to that, when the load is very low at high speed (55-75+), EV mode often activates and I have noted this is not discussed/mentioned anywhere that I could find.