The first judge who made the original ruling was a Liberal appointee (can't remember if specifically Trudeau or not) who explicitely stated that he didn't like the Convoy and he not only ruled against the invocation of tne Act, he wrote that, even if his main reasoning were overturned, there is also secondary reasoning that also wouldn't have allowed the act to be used.

For the Supreme Court to overturn this ruling they would have to explain how three appellate court judges were all wrong and then explain why both of the original reasonings were wrong.

It's possible, but I don't exagerate in saying it would be the end of the rule of law in Canada.