There are very few parameters that make sense to update 200 times a second if not the actual voltage level to subtract. If you adjusted EQ parameters 200 times a second you'd just be injecting a ton of noise in the center of the audible band due to phase jumps.
Edit: There is reason to believe it is just 200 Hz ANC. It's the same wording used in Beats over ear headphones that have a W1 chip and ANC. Those headphones have abysmal ANC that doesn't do anything above 500 Hz (aside from adding in some noise).
Edit: There is reason to believe it is just 200 Hz ANC. It's the same wording used in Beats over ear headphones that have a W1 chip and ANC. Those headphones have abysmal ANC that doesn't do anything above 500 Hz (aside from adding in some noise).
https://www.engadget.com/2019/10/28/apple-airpods-pro-announ...
https://www.engadget.com/2019/10/15/beats-solo-pro-headphone...
https://www.rtings.com/headphones/reviews/beats/studio-wirel...