> Realistically, what they are doing is making full resolution prints on commercially available large-format photograph printers, with their effort going into tweaking the shaded relief algorithms and applying photoshop filters to boost local contrast.

Yes, exactly this.

> Marketing copy exaggerates a bit, film at 11.

And yes, also this, ha. We sell wall art, so the article is intended to convey that for something you look at on a wall, we're running up against the limits of what a human can see, with normal vision, at any reasonable viewing distance. It is absolutely true that someone with good vision, the right light, and a magnifying glass could probably see some dots, but that's not typically how wall art is viewed, which is what we design for.