[sbuttgereit]

Of course he does. By choosing a GNU license he explicitly limits the choices available to anyone that might make use of his software in their own software projects. That's the whole point of the license to limit the freedoms of developers in favor of users... his favored group. Even then, his plea is for developers to willingly limit user choice in regard to proprietary software. Sure, his license doesn't legally prevent this, but he's asking developers to de facto limit user freedom to choose their operating environment in favor of his approved systems.

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.