Their point is that people do pay for these services and they have still introduced ads to squeeze out more revenue. Ergo, paying for a service guarantees nothing.
I pay for those services and do not get ads and that is on a machine dedicated to corporate crap. No addons installed. I even use Microsoft Edge so they think they are tracking me.
The one and only exception was the movie "Person of Interest" which was FreeVee only for reasons I do not understand so I put up with their ads and then purchased the box set on DVD. The ads were so weird it was entertaining to watch them. They were clearly all created in China and I am still not convinced the actors were real people.
Netflix has continually raised prices, and earns more from the ad plans than those paying more for zero ads.
Becoming a paying customer is just a negotiation with advertisers to raise their rates until Netflix concedes to what they want. Since they know you have more discretionary income Netflix can also charge more for ads. They're also incentivized into turning those customers into ad supported by increasing the no ad plan cost.
Which affects the decision making of the company. There are things they won’t platform for fear of offending an advertiser. The effect is pervasive, regardless of whether you are paying the full rate or not.
Frankly people should stop paying for anything with ads. But they don't. They love them. If netflix had a free tier with tons of ads, it would be by far the most popular.