It doesn't use Location Services to determine the location. It use the registered location associated with the IP address the device is assigned. If you are connected via VPN or are using a service provider that is registered in Dallas, then that is what it will show.
See here: Two-factor authentication for Apple ID - Apple Support
Specifically:
When you sign in on a new device, you’ll get a notification on your other trusted devices that includes a map showing the approximate location of the new device. This is an approximate location based on the IP address the device is currently using, rather than the exact location of the device. The location shown might reflect the network you're connected to, and not your physical location.
If you know you’re the person trying to sign in but you don’t recognize the location shown, you can still tap Allow and continue signing in.
However, if you ever see a notification that your Apple ID is being used to sign in on a new device and you're not the one signing in, tap Don’t Allow to ensure the sign in attempt is blocked.