Politicians of all sorts have been saying lots of things for decades. The fact is, nobody as influential or as powerful as Trump ever actually did anything about most of them. In particular, the anti-China anti-offshoring sentiment.
It took Trump yelling about it from the rooftops for over 5 years, and getting over half the population as passionate about it as he was, and then Trump actually doing things about it while in office, for things to actually happen and be set in motion.
You still failed to prove that he "did nothing"; choosing one particular metric that shows there was zero change does not mean Trump did nothing. It just means the trajectory didn't change, by this one metric.
You also don't account for the fact that there may have been a negative change in trajectory of that particular metric if not for Trump's policies and executive actions.
But, again, he absolutely did do things about it, these are all well documented. (As is the change in trajectory of public opinion towards offshoring thanks to Trump promoting them heavily.)
It took Trump yelling about it from the rooftops for over 5 years, and getting over half the population as passionate about it as he was, and then Trump actually doing things about it while in office, for things to actually happen and be set in motion.