Couldn't that dust he talks about be red dust? Oh, and he seems to be assuming our atmosphere is the same as Mars', which it isn't. Mars is 90 some percent carbon dioxide, with little nitrogen and even less oxygen. So the light is scattered differently.
Also, he seems to assume that blue light is removed from Earth's atmosphere by Raleigh Scattering, but if it was, I couldn't see any blue! No blue light! And, of course, he seems to think that they know what Martian dust is made of, when they don't.
The easiest way to prove Mars has a red atmosphere is get a telescope. Earth looks blue because of our atmosphere (somewhat) and when you look from space, to just above the horizon, you see blue. I believe the same for Mars.