As far as fic go, Harry using the Press to his advantage is not original and there were several done before this. What makes this fic an interesting gem, however, is how
he uses it, by writing what is essentially an opinion column under the particularly ironic alias of Oliver Twist. Over the course of the series, we're treated to a vicious deconstruction of the Harry Potter universe.
Still, it is not for everyone, as it does not hold back any punches on many of the characters. Much of the Flanderization comes from that, but it should also be kept in mind that many of the characters are
that two dimensional in canon for much of the series. Considering that the fic takes place in Harry's fifth year, where we see many of the characters at their most unsympathetic portrayals (Molly's Flanderization in fanfiction is largely based off of her character's portrayal in Order of the Phoenix), this should be kept in mind.