You didn't read the article, or you didn't understand it.
The US Govt would not pay a cent for the shares of these companies.
It would simply seize them, half-nationalize them.
That... that is 'socialism', a form of it, that's the government deciding that wealthy private equity/stock owners actually don't own that stuff, because 'we are the government and this is ours now.'
This is... is a form of what the US has previously used the CIA to overthrow a number of other country's governments for, when they did something like this.