I'm just going to have to fundamentally agree to disagree. I would 100% endorse this quote if we were talking about novels or theatrical plays, and maybe 50% if talking about movies (Godfather? Yes. Alien? Nah).
But a game, outside of odd niches like visual novels or 'walking simulators', is a much more open-ended experience, and the expectation of a sequel is not merely to continue the story - that's typically called an 'expansion', a concept that doesn't exist in novels or movies. A sequel is generally expected to innovate, and the longer since the previous title the more innovation is expected.