The source presents one roaster's argument against a rigid division between light filter coffee and very dark espresso. Its starting point is that extraction and equipment limitations can influence how a roast is designed for its intended use.
That is different from saying one roast profile suits every method without adjustment. A coffee prepared as espresso asks for a concentrated balance, while filter brewing presents it differently. Roasters may make deliberate choices to support those applications without following a universal color label.
When buying, ask what espresso or filter means in that particular roaster's range. Read the flavor description and use a recipe appropriate to the coffee and equipment. Treat the essay as a reason to question shorthand, not as a claim that every consumer should prefer the same roast or that a bag's intended application is irrelevant.
The conversation
A good question can make a better brew.