It does matter: you can no longer sue for copyright violation, you can only sue for contract violation.
If you violate a contract, the court will order compensation calculated to "make you whole" again - to restore things to how they would have been before the contract was executed
The author seems to think there may be some issue for a writer of free software to demonstrate that he had been harmed by the violation; which wouldn't be an issue in a copyright suit. Well, at least here, copyright violation carries statutory damages.
One of the strengths of the GPL is that companies don't like it for some reason. Since they don't like it, you can offer to sell them different licensing terms. That is what the damages are. It's not $0, it's all the money you missed out on from not being able to license your project.
If you violate a contract, the court will order compensation calculated to "make you whole" again - to restore things to how they would have been before the contract was executed
The author seems to think there may be some issue for a writer of free software to demonstrate that he had been harmed by the violation; which wouldn't be an issue in a copyright suit. Well, at least here, copyright violation carries statutory damages.
IANAL.