Tesla is not even a monopoly on BEV sales. They have somewhere between 50-70% of the current market share in the US, but every projection has their market share decreasing, some to as little as 10% of the market in the next 4 years. That's definitely not a monopoly.
Then there's the issue that he stated that Tesla "prevents Tesla drivers (who are the majority of BEV drivers) from fast charging elsewhere other than the Supercharger". Which is also not true. They've had a CHAdeMO adapter available for years, and their newest vehicles have CCS protocol support in the charge port ECU. And new charge port ECUs and CCS adapters are available to those who really want to get them. They'll even sell you a CCS-enabled charge port ECU at an official Tesla service center, through official channels, RIGHT NOW. That doesn't sound like a company that is actively trying to prevent drivers from fast charging at places other than the superchargers.