Even though you might be using a VPN service, Google can still see your location with the help of (ABS) or automated bot systems.
These bots are normally referred to as VPN detection bots and are designed to detect whether your IP Address is associated with a Hosted VPN Server or with your local ISP.
Google’s algorithm is smart enough to detect inconsistency in your geo-location and also identify blacklisted IP addresses.
Then what’s the point of a VPN ?