The purpose of the law is to make sure, that those bubbles are about equally sized for everyone.
Rights are "not absolute" only is the sense that exercising your right does not absolve you from responsibility for violating other people's rights. So, if you exercise your right to freely use your property, say, a gun, and shoot somebody - you'll go to jail. But not for using your gun - but rather for violating other's right to live unshot by your gun. Your right to use your property didn't go anywhere, but it also didn't remove your responsibility for the consequences of such use. If there's no consequences, there's no place for government to intervene (I know most governments disagree, of course they do).
This seems to be the most natural definition of rights. I can say whatever unless doing so prevents you from also speaking. Thus, I can't use even larger speakers to drown out what a protesters outside my factory are saying. But, I could use them to convey my message.
[1]https://www.btg-bestellservice.de/pdf/80201000.pdf - see Article 5
Second, "freedom" is not a right and never has been. It is not a useful term on its own. You can be free to do something, or free from something, but you can't just be generically free.