Yes but sec def has to also authenticate before any launch.
OK—so imagine the Secretary of Defense says “no”.
Bidet fires him on the spot.
Rinse and repeat as necessary....
The fired Secretary of Defense could try to collect the cabinet for a 25th amendment meeting, but if he was not quick enough and his replacement (or their replacement...) said “ok” to Bidet, it would be too late....
Plus, all this stuff is happening in a few minutes—would be totally crazy....