I have had two cases like you described where, in a right curve, an oncoming car switched to the center left turn lane, pointing their car at me briefly and setting off the red warning light. In both cases, if the car had actually been coming at me at that speed and distance, a head-on would have been unavoidable, so you’d think any automatic braking would have been applied immediately. However, in both cases, the brakes were not applied by the vehicle. I was reacting and covering the brake in each case, but both times the threat went away before I applied much brake if any. That makes me wonder if it’s not programmed to apply AEB in a head-on detection, maybe due to the false alarm propensity. Just a guess, though. None of the material I’ve found addresses behavior of the system in head-on warnings.
I will say the system has given me numerous legitimate rear end warnings, zero rear end false alarms, and only those two well understood head on “false” alarms, that really were legitimate warnings until the other car changed direction away from pointing at me. The only brake inputs I’ve experienced were in the recent potential rear end event I described in the first post here, and as you said those may have been just IBA and not AEB. No unwanted braking. That’s in two years and 8,000 miles of mixed driving. Nothing about that record makes me distrust the system, so I’m leaving mine turned on.