Imagine two nations. A wealthy nation that used to innovate but has completely stopped innovation. It could continue to make advanced things using existing infrastructure and people, but could not improve beyond its current state. (This is the extreme, for illustration).

Then imagine a larger poorer nation that is rapidly advancing. Even before the poorer nation has surpassed the other in technological capabilities, it would be producing more total innovation per year. Growing requires lots of innovation. Stagnating... not so much.

So I am suggesting that the rate of innovation could be slowing in the US, and the rate of innovation could be higher in China. Even if absolute output is more advanced in the US, which would be a different metric. But the rate of innovation is important for projecting where each nation will be in the future, and I do believe intellectual property restrictions slow the rate of innovation.