This isn't really a concern when at the same time the people wishing to immigrate vastly outnumber the people accepted for immigration, as evidenced by the yearly limit for most visas being reached within days.
Why did you move the goalpost towards "innovation"? If you're on an H1B visa, you're probably contributing to some company attempting to be innovative. If not, who cares? The economy doesn't run on innovation alone.
The thesis of the article is that the US economy's "Great Stagnation" in productivity is due to a lack of innovation. There are no goalposts being moved.
Contributing to a company attempting to be innovative doesn't mean that you are being innovative, and so the degree at which you are capable of innovation doesn't matter very much. As for people being recruited specifically for innovation, there is essentially no limit in their immigration.