Well, he does seem to want to portray it as dishonest when he says:

  There's a dirty little secret when it comes to the
  stunning images produced by the Hubble Space Telescope.
  ...
  The scientists connected with Hubble take liberties no
  journalist would ever get away with--though in the name 
  of science.

For one thing, it says it right in the name "false color image". There is no deception here. For another, journalists regularly print these images. So, technically, they have no qualms about it either (and they shouldn't).