The US needs to bring back manufacturing for strategic reasons and in strategic areas.
And it needs to have the capability to scale up manufacturing in response to emergencies.
But also, importantly, the US doesn't need to do this by onshoring all manufacturing. Near shoring and friend shoring will have to be extremely important components of adding these capabilities, and unfortunately, teh actions the US is taking will likely hurt nearshoring and friendshoring and will end up making the US less strategically capable in manufacturing even if it's able to reshore a significant amount of manufacturing.
The communication isn't the waving in "reaction" (it's not clear it's simply a reaction, but let's assume it is) to the original wave, but the original wave itself.
And the fact that it's also triggered by videos indicates it's not just a mechanical reaction (like some of the research about how plants "communicate" is which are essentially mechanical responses to stimuli).
However, this doesn't necessarily mean that the communication is meaningful. It just shows that a means of communicating exists.