This just isn't true. It's human nature to innovate, just as it is human nature to sing, play music and dance.
There are many times when the IP system is not only absent, but actively working against the creator, yet it doesn't stop the process of innovation. It just slows it down.
The government also innovates and foots the bill for R&D, and there is a good case to be made that the most valuable technological innovations in our society do actually come from them.
Straw man fallacy.
The OP wasn't suggesting that literally nobody would innovate, just that innovation, particularly innovation paid for by private parties of the sort of thing which is expensive and easily copied, would significantly decline.
If you have ever paid to see someone sing, play music, or dance, you have participated in an activity which likely would not have occurred without there being a monetary incentive for that person to partake of the activity you paid to enjoy.
That the current implementation of patents is highly flawed doesn't affect that basic fact.
It's highly relevant. If the patent system is being given credit for innovation taking place that would have taken place anyway, maybe it should be dismantled or at least heavily scaled back.
It doesn't matter to someone explaining that good rents exist. That the 5% exist at all allows a demonstration of the concept.
The article mentioned that the patent system overshoots, with a link to more info. That's all that's needed.
It seems like a real stretch to call a drug company that researches a completely new drug and patents it "rent seeking", even if they can be said to enjoy "monopoly rents" ex post.