No, the author doesn't try to limit anyone's freedom, he only asks people to understand him and to work against proprietary platforms, not prohibits them to do anything.
He then goes on to say that he won't permit his software to be compatible with other platforms like Visual Studio, _even at the cost of performance_.
If that's not cutting your nose off to spite your face, it's still definitely a direct attempt to limit your freedom.
Even though I don't agree with his position (I fit in the "I don't care if it works on Windows or not, if you care pull requests are always welcome" camp), it's a reasonable one to have.
If he were merely trying to convince users to move to Libre systems while making no plea to the developers that might otherwise enable users to choose against his wishes, you might have a point: but that's not his goal.