OK. But is the meaning any less literally-obvious than "grocery bills" or "electricity bills"?

Maybe you don't have "hospital bills". I don't have "landscaping bills", but I know exactly what they are.

Sure, but my main intent was to raise the question as to why it was singled out in the article/blog post as something that needs to be in the dictionary.

As you've pointed out, the word "bills" clarifies what it is. I don't see why every combination needs to be in a dictionary. The list would be incredibly long, eg. "phone bills" or "power bills", etc.