I actually think that hes trying to say that they can say whatever they want but people still would doubt that they don't store any data as long as they are located in a country that doesn't have strict privacy regulations. So they decided to move to switzerland so that people have a reason to believe what Quad9 says. So basically a move to convince people that they actually don't keep any logs. And he actually mentioned multiple times that they don't store any data from their customers. There is also a comment of their Youtube channel below the video.
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In the end it's up to you if you believe what they are stating in their privacy policy, but to me it seems that the company is trying to be as transparent as possible which can't be said about quite a few other DNS providers.