Replacing the DNS provider with Google's DNS, shows one of the provider's DNS, does this mean that it replaces the DNS?

Question

Domain Name System

I changed the default DNS of the provider to Google's 8.8.8.8 / 8.8.4.4, but when checking, the result shows the DNS of the provider (different from the standard DNS), does this mean that the provider replaces the DNS?
Some time ago, checking for DNS leaks on various sites gave Google 8.8.8.8, but now for some reason, the check shows the IP of the provider

Answer 1

In order to save money, your provider, in order to block prohibited sites, simply redirects your dns requests (port 53) to its server. You can solve this using vpn, for all traffic, or only for dns requests.

Answer 2

And by what method did you find out that the provider replaces the dns server?

Answer 3

Rather yes than no