He does parody stuff, illustrating the logical failings of those who oppose his view
Rush has plenty of, uh, "logical failings" of his own. See below.
All you got to do is go back and read his books and listen to him for a few hours to know that he hasn't changed all that much....
Right, let's talk about his books.
In one, he tells people to stop worrying about the ozone layer because "the Sun makes ozone." A half-truth: yes, the Sun does make ozone, but it can't make it fast enough to overcome the destruction of ozone by CFCs.
Another similar fallacy: he says there are more trees in the USA now than when the first settlers arrived, so stop worrying about trees. I don't know, maybe that's true, but he ignores the fact that we are cutting these trees down at a much higher rate than the settlers ever did. Forestry management is about ensuring rates of growth are higher than rates of depletion, not how many trees you have at any moment.
I agree that Rush hasn't changed all that much. And he's still wrong.