According to the Merriam Webster dictionary, the term is ideal. We've just come to think of white supremacy as something that other countries do, and with more visible genocidal outcomes. This is the byproduct of fictionalizing our own histories to aggrandize our place in history.
https://www.merriam-webster.com/dictionary/white supremacy
Except that definition is not suitable to describe America today. The previous example of POC being elected to every level of government has been presented. presented. The more important model IMO is POC Law Enforcement Officers enforcing the law on people on people of European Ethnic origins.
It simply is not a White Supremacy any more. The term being used is intentionally shocking and controversial in order to provoke a falsely powerful reaction from the audience.
Society that has an untargeted predisposition to be more easily navigated by the vast majority of people who live there and represent an ethnic origin that started and designed most the Country isn't as easy to leverage when trying to place blame though.
Why is it no one is talking about Asian Supremacy in Japan or China or Black Supremacy in Rwanda?
Right now, today, POC Agents of the State (your supposed White Supremacy) are sing a wide variety of exciting new Choke Holds on White People in a whole exciting and fresh new bevy of jackboots being shoved directly into keisters. It just is not a White Supremacist society.
We had a White Supremacy up until it was made illegal in the Late 60's with the two civil rights acts. That previous White Supremacy was particularly devastating to the Black Community, who was more specifically and harshly terrorized and targeted than anyone else, a terrible social behavior with roots in the ugly British tradition of Slavery imposed on this nation when it was still colonial.
Just as the White Supremacy was forced to end with the 2 Civil Rights acts of the Late 60's, an unfortunate shift in the economic structure of our nation caused the Middle Class to stagnate and enter a decline that has been a decades long growing era of divide between upper and lower class income brackets.
The Black community, which had been disproportionately forced into poverty through the White Supremacist conditions of Jim Crow America found now that they had been liberated from targeted oppression by Government that the financial opportunities that had elevated the Middle Class in the 40's-60's were now drying up in the 1970's and by the the time the Reaganomic decline of the 1980's arrived, the opportunities to rise outside of systemic poverty had well nigh dried up.
The result of that shift is that the Black community that had previously been forced into poverty and now found that those born into poverty found fewer and fewer ways out over the coming decades, found that they were disproportionately the victims of the new American War against the poor.
For decades a 2 party government has fed on xenophobia and fear of change on one side and the phantom of of past injustice on the other to wedge their constituents against real solutions on both sides while the power brokers get wildly wealthy off of the still raging war against the poor.
I promise very rarely, but I promise you that if this nation would makes the necessary systemic changes to address real and meaningful class justice reform, the Race conflict problem would mostly just disappear.