Does this also mean that they're the largest private recipients of farm subsidies?
That's very much a means-tested program to prevent farmers from being driven into bankruptcy by tariffs on things they've already produced. It's not a magic money fountain.
That type of info should be a whole lot easier to access and digest than it currently is.
Note that the same report says that excluding subsidies, farmer net income increased in 2020 over 2019, so I'm not convinced the Covid pandemic is a good reason.