Yes, he knows. But the point is: They say they're going 20% of the speed of light (in pixels). But the closest approach of Earth and Mars is about 4.35 light minutes away from each other. So if our virtual speed is 20% of the speed of light, it follows that the page should take more than 20 minutes to reach Mars. And it doesn't.
It doesn't even take 4.35 minutes, so the page must be continuing to accelerate past the 20% c measure, to superluminal speeds, in order to finish in a couple of minutes or so.
The page flashes for me a couple of times, after which the starfield is still and then rapidly speeds up again. I assume this means that we're travelling with the assistance of warpgates or similar - and at 127km/pixel, it's unlikely that the warpgate or the ship would show on the map.
It doesn't even take 4.35 minutes, so the page must be continuing to accelerate past the 20% c measure, to superluminal speeds, in order to finish in a couple of minutes or so.
Which they don't mention.