I don’t know where you are getting these “talks and warnings” from, but I suggest you stop taking information from that source. China is not going to start a war with the US, because without us their country will collapse, not to mention that we would very likely win a war against them. No one is looking to start World War 3, especially in the current climate.
It is patently ridiculous to imagine that the US government is totally cool with this impending strike, or can do nothing to avoid it, and is keeping us all at home to somehow prepare us for it. Even assuming that this was the case, how would a stay at home order be preparation for an EMP strike? Wouldn’t better preparation for a strike that would take out most of the US’s electrical devices be a summer full of outside work and play, which would make people better prepared to live without electricity?
Are you possibly saying the Chinese released the virus to keep us at home as preparation? Why would they want to prepare us at all?
While an EMP bomb is a legitimate tactic that might be used in warfare (although it is tantamount to a nuclear strike, and the most effective EMP weapons are in fact nuclear), I don’t know what you mean by “attack on the electrical grid by overpowering it”. An electromagnetic pulse is simply a pulse of electromagnetic energy that causes a massive power surge, destroying all electronics, not just those hooked up to the grid. EMPs can be naturally produced, or manually produced.