Given that she doesn't say anything about what the alternatives should be, we can only speculate. But she would seem to be implicitly pushing that comics should be written from the upper-middle-class, westernized, college-educated liberal worldview: characters' race and sex should be interchangeable, every combination of physical characteristics should be represented but shown as irrelevant to their behaviour and culture. Characters from any time or space should naturally hold the same moral positions as any respectable westernized college-educated liberal; the reader should never be so much as exposed to characters with offensive views, much less asked to try to understand or sympathise with them. Religious and cultural differences are as precious as they are purely decorative; it's impossible for them to lead to deep moral conflicts between decent people (and of course anyone who isn't a straight white male is always decent).

Of course that's a reductive, unsympathetic view on what she's saying - but so is her approach to Miller. Perhaps she'll come up with a positive, expansive direction for comics to go in, one that makes for a richer and more deeply textured world rather than one that flattens all characters into the superficially-diverse-but-deeply-identical mold. But that's not the direction I've generally seen from people saying things like this.