Again, it's like you didn't read the article except the tiny bits that fit your confirmation bias. It's not saying that America is "not independent", it's not saying the oligarchs "control America". It's saying disproportionate wealth equals disproportionate power. Which should be obvious, no person should have too much wealth or too much power. That's why the US government was designed with checks and balances built in, which is not working as well as desired, but works farrr better than you see in a dictatorship like Russia.
There's no secret group controlling this big US Empire of vassal states. It's many many rich people of varying degrees of wealth (from the US or the UK or elsewhere) all fighting amongst themselves for more, and most of the time hurting the rest of us common folk in the process.