Directly from the article re: the horns;
'The hearing came as an interim 10-day injunction to silence the horns was about to expire. The injunction was brought by a private citizen, 21-year-old Zexi Li, who said the sound of constantly blaring horns was unbearable.
Initially, the injunction worked with the truck horns falling silent soon after the court order was issued. Within days, however, the horns started up again. Lawyer Paul Champ, who represented Li at the hearing, promised to take additional steps to ensure the order was enforced.'
Obviously the injunction wasn't about the protest per se - you can't have an injunction against protests because act of protesting is completely legal in Canada (as it should be). The injuctions were about specific actions being committed by the protesters that were illegal - the honking was one of them, as was blocking the Ambassador Bridge.
As I mentioned, there was injunction recieved by a government, the city of Windsor. You argument is literally 'it happened somewhere else so it doesn't count'. The blockade at the Ambassador Bridge was also a part of the convoy protests, as were the events in Ottawa.