You're pretty much describing a "smart"/active jammer there.

The difference between this and jamming is signal jamming typically uses noise on the same frequency to make it impossible for the receiver to understand the signal. Basically, jamming blocks ALL communication on that frequency. This just shuts down the specific AP by deauth'ing the clients.

Dumb jamming, yes. Smart jamming tries to interdict the enemy's communications. Look into the the more advanced ECM/anti-radar stuff.

Everyone jammer is a DoS attack in one form or other. Either way you're flooding clients with junk disabling the connectivity.