I would agree on this assessment. Revenue parking is a big part of the story...with most wealthy Chinese now worried about some Chinese police arriving at their door over corruption issues or hidden wealth (which they all do now). They all have some plan B, where the family sneaks out of China, and has enough cash in the US to reestablish their lives.
As for the US selected as a place to park money or reestablish? Look around. With the exception of Canada, I can’t think of another western country where you’d be welcomed as easily (for cash bribes of course) and that the economy is fairly stable. We may not see that in our own country, but we might be blinded by current circumstances.
A lot of the same Chinese who are buying homes also coincidentally are visiting their homes here in the States when their children are born “unexpectedly” premature