[zelphirkalt]

But how does any of this make it untrue, that copyleft is an important aspect, without which the freedoms are not maintained?

You quoted 2 phrases, which are not wrong, but which do not argue against what I wrote before. Here are more quotes from the same pages:

"Second, when a program's source code carries a weak license, one without copyleft, its executables can carry additional nonfree conditions. Microsoft does this with Visual Studio, for example."

It should be quite clear, that, when I can copy a program and modify it and then release under a different license, I can circumvent user freedoms easily. Do you have any counter point to this? What exactly are you trying to tell me?