Net neutrality is about treating some services (websites) different than others. If they throttle all traffic then that's still neutral. Do you see services they exclude (e.g. not count as traffic)?
I am a business account. I have an option to pay more each month and not experience these limits. Is that not what net neutrality is designed to avoid?
It would violate principals of net neutrality if say, YouTube and Netflix were throttled once you reach your 22/GB cap but all other sites were left to normal speeds.