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The law in question immunizes telecoms that broke the law.
Therefore, we can conclude that the existence of the legislation demonstrates that some telecom, somewhere, broke the law.
Also, even if no telecoms actually broke the law, voting for this legislation would still [strictly speaking] immunize "theoretical" telecoms that broke the law.
If I as a Congressman vote for legislation immunizing people for killing the Pope, it is perfectly valid for someone to accuse me of favoring legislation immunizing people for killing the Pope, even if the Pope is still alive. To vote for the legislation, you have to be willing to immunize lawbreaking telecoms, in the event such lawbreaking is shown to have existed.