Some of his arguments are even outright wrong. The anonymity of VPNs is based on the idea that you can hide in the crowd. Several different VPN providers using IVPN means that the crowd you hide in is even bigger.
The argument was not that having more people using a VPN was bad. It was that these VPNs are commodities. They use the same protocols, the same data centers, and it’s really just marketing and… customer service. With if that is Gmail, isn’t worth much.