Keep in mind, if you are using a VPN, connecting to Netflix will fail, your banking institutions, including PayPal, will flag your account and potentially shut it due to suspicious login behavior.
I think that text is misleading since if you use OpenVPN you can get ovpn files from your provider and set up a split-tunnel configuration. All traffic except torrents will go out your normal connection.
Then set qBittorrent to ONLY use the OpenVPN virtual ethernet port as its connection and it's a kill switch, if VPN isn't connected qBittorrent won't connect.
You just need to put this in your ovpn file from your VPN provider:
proto udp
dev tun
keepalive 10 120
nobind
persist-key
persist-tun
dhcp-option DNS 208.67.222.222
dhcp-option DNS 208.67.220.220
block-outside-dns
route 0.0.0.0 192.0.0.0 net_gateway
route 64.0.0.0 192.0.0.0 net_gateway
route 128.0.0.0 192.0.0.0 net_gateway
route 192.0.0.0 192.0.0.0 net_gateway