The focus is on the commerce clause in this article. I don't favor rolling back the commerce clause either. That is one judicial "mistake" if it was, that should not be undone. The nation could not effectively function with a narrow reading.
"Activist" appears to mean anyone who doesn't find anything in the Constitution that mentions abortion, gay sex, affirmative action, or the welfare state.
I suppose it means someone who can read, rather than imagine what it is they would have liked to have read.