You're missing the point here. Yes, late payments are normal and happen all the time. What's happening here is not simply a late payment. It's a refusal to pay an already agreed upon price as a negotiating tactic in order to get a significantly cheaper price. How many stories of that do you have?

If the story here was just "Twitter is late paying its Google Cloud bill, and Google is giving Twitter additional time to pay in full", then that wouldn't even be much of a story.