Strange 
seems like they changed their API or smth…
I found another API: https://proxycheck.io/
You can parse the result with the JSON component, and get the “type”
Here with nordvpn:
I am connected to the belgium server, and you can see that in the “type” return “VPN”
(I’m using ubuntu so yeah)
Without a VPN it will output "type": "Residential"
So from this you can check if the value of “type” is a VPN.