Definitely a step out, but they know few people will go the full 20,000 miles ( the bottle says 1 year or 20,000 miles, whichever comes first.) I would not worry about the one year part. The oil isn’t evaporating.
They know darn well, if you are driving 20,000 miles in one year, you must be driving highway miles, which are easier.
Some big truck diesels are going 50,000 miles between changes. Yes the diesels lubricate but that is why gas engines are allowed 20 Instead of 50,000 miles. A UOA after 20,000 miles would tell the story.