I just went out to my drive way and tested this.
Unlocking the door with just the key, then opening it, sets the alarm off for sure.
Putting the key in the ignition DOES NOT stop it. I didn't get as far as trying to turn the key, the horn is so loud and I didn't want to wake my neighbors up!
P.S. Now I tried it and turned the ignition, no go. I can't see any way to turn the alarm off except with the keyfob.