Are they saying I stand out more using my VPN and I should not use it? ( See below)
If so, is this DNS going to hide my IP address?
Is it already configured or do I need to go into settings and enable DNS like on a regular android OS?
A VPN provides a network layered on top of the underlying networks and the OS uses the VPN-provided DNS servers for everything beyond resolving the IP address of the VPN and performing network connectivity checks on each of the underlying networks in addition to the VPN itself.
Using the network-provided DNS servers is the best way to blend in with other users. Network and web sites can fingerprint and track users based on a non-default DNS configuration. Our recommendation for general purpose usage is to use the network-provided DNS servers.