i believe he says it is not science, but rather theology.
Creationism is theology. ID is philosophy.
Whenever you get into things we don't understand you're always bordering between philosophy and "science".
As someone how they differentiate science from phiolosiphy, and you'll likely be able to give them several examples of things they consider science that don't fit the definition.
Then ask them how to explain the origin of the universe through science.
I'm not a fan of Robertson, and I do think that he is pushing for creationism to be taught in schools.
However calling ID "today's tarted-up version of creationism", is just as close minded as Robertson.