Doesn't matter, since that clearly wasn't the purpose of the article. After all, they were totally happy to add an index for another competing DB as long as they happened to win that comparison. Then they crow about how they beat having an index.

Pretty sleazy.

So, maybe do not create specific scenarios for corner cases and then generalize outcome? And write articles about common scenarios that is important for people who will use technology on daily basis.

My personal view is that having fast queries without indexes is quite general outcome.