Sigh...... sigh....
Your chatgpt is only partially right. DNS does not affect the quality of a stream, but it may affect which network end point a Qobuz stream is served from. Every DNS server does not always resolve the right end point for every service. For instance, if you are in Texas and the DNS server resolves to a Qobuz service in Ireland then you are more likely to have network issues.
For residential Internet customers, by default your router will use the Internet provider’s DNS servers/services, so besides the backbone and on/off ramp locations the other variable between say AT&T and Comcast is the DNS servers themselves.
I worked in ad tech, and helped monitor global network operations, not my core job. While this type of misconfiguration was rare they do happen.
In any event, you should use OpenDNS or Quad9 just as a matter of privacy. :)
More likely this is an MTU issue or a route issue. If you can find the exact IP address used for streaming (not necessarily the web page) you could run traceroute and ping and gain more specific information about the pathway between you and Qobuz.

