You should not simply stall just because the engine has failed - in any flight regime - because the aircraft will continue flying at the trimmed speed.
I see that if you gradually reduce power over (say) a minute the aircraft will naturally tend to a trimmed glide without pilot input, but I don't see why there should be any law to the effect that if you suddenly cut power the aircraft will immediately tend to the glide attitude.
In fact, the drop in power could be considered instantaneous, but it will take a finite time for the aircraft to change attitude. During this time, it's airspeed must inevitably decrease and I would have thought that whether this decrease takes it below stalling speed would be very much type-dependent.
My reading is that Pilot Dar's experience tends to confirm this.