They use CBT for anger management classes, so I think you are right about this. It doesn't stop you from lashing out. It gives you resources that might help you

They use CBT for anger management classes, so I think you are right about this. It doesn't stop you from lashing out. It gives you resources that might help you head off that process that usually results in you lashing out. It doesn't cover underlying causes there. CBT doesn't work by alone. It needs other therapies to complete the cycle.