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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"
The largest iceberg ever was B-15 in 2000.
Can you be sure that any iceberg was generated by climate change? Maybe, for the sake of argument, 7% of every iceberg is?