Maybe I've misunderstood, I'm not a climatologist, but I thought climate change means certain events become more likely but it's still impossible to say if climate change caused any single individual event.

For example, if climate change makes it 7% more likely to rain somewhere, it doesn't mean every rainy day is climate change. You can only say climate change made it 7% more rainy on average.

So climate change increases the chance of phenomena like "World's largest iceberg", but you can't say for sure if this iceberg in particular was generated by climate change.

I think that's all the article was trying to say with "could"