Yes, the second star would add to the brightness and make things closer. Also, I didn't see in the article what the actual brightnesses of the two stars 1,000 AU away are relative to the brightness of the Sun. I just used the Sun because it was easy to look up the relative brightness of the Sun vs. the Moon. :-)

Edit: I see from looking at more recent posts that the two distant stars are thought to be spectral class G and M. The Sun is a G, so it should be about the same brightness as the brighter of the two.