Love him or hate him, this ruling is not actually about PM, but about free speech in the media. It was clearly stated that a journalist is allowed to express an opinion, so long as it is robustly challenged, in other words, the discussion is balanced. I think it is the right decision.
GMB is not actually a news programme, although it covers topical events, and the main headlines. I think the term is ‘magazine.’ It is a magazine type programme. A straight news bulletin would The News at Ten, or similar. Incidentally I have never watched GMB and I didn’t see PM and therefore don’t have a clear idea of what happened, I only know what reportedly happened, but it doesn’t matter because the ruling is what’s important, not what PM said.