Has it been confirmed that there were no existing cheat/hack tools installed on the PC already? I'm possibly missing the smoking gun where it's definitely a remote code exploit and not just the player having cheat tools installed on their PC and accidentally activating them, then pretending to be very alarmed at what's going on.
Sometimes, at least, the 'add to cart for price' is done because the manufacturer or distributor of products will forbid retailers from advertising lower prices on their site. When I worked in an industry that had these policies enforced, the reasoning we were given was that the policy was in place to maintain healthy competition between retailers selling the same products.
You can set up zones based on your phone's GPS (there is a Home Assistant mobile application that can report data back to the server), or you could set up an automation based on whether your phone is connected to your home's wireless network. Or probably even via some Bluetooth beacon.