I suppose in reading the report, it didn't indicate that the fish caught was on a barbed hook or not. Just assumed that it was, which could be short sighted of me. That being said, if the fish was caught on a barbed hook, and it wasn't in the circumstances described above, then a fine should be warranted. If the accused is actively fishing with a barbed hook, they should be fined. If, like Trailhead, he was fishing with what appeared to be a barbed hook that wasn't 100% crimped down, but everything else was fine, then a warning.
I guess it's a judgement call, based on the circumstance.