If anyone ever mentions petrodollars, CBDC, or crypto to you, they are crazy and I recommend stealing their wallet.
At best this kind of stuff is a harmless ideological pressure release valve for a discontented middle class / small business / entrepreneurial layer squeezed from above (esp after COVID). At worst it veers into outright authoritarian & xenophobic politics and often blends in some anti-Semitism. Starts with rants about Bretton-Woods and the next thing you know you're hearing about the Rothschilds.
There was a whole wing of this stuff ascendant in the 1930s (in western Canada we had "Social Credit", for example) whose ideological purpose was to displace left wing populism and anti-capitalist politics with an explicitly pro-capitalist highly social conservative narrative which pinned blame for problems on "international banking" and, ultimately, Jewish people.
The latest flavour is obsessed with talk about "petrodollars" and cryptocurrency, and then you scratch a little and there's the face of Sergei Lavrov or Marie Le Pen hiding under the paint.
The world is f*cked and unjust but not for the reasons that these people go on about.
I do agree that the bulk of the foundation of the world's economy is constructed over the petroleum economy. Though I also don't think the nature of power in the world would change significantly if that were to be replaced with something else or if the nationality of the currency it is traded in were to change.
This is an primarily American phenomenon though and it's only really true because of the dominance of the US and US petrodollars over global society. It's probably not easy to spend Turkish lira in Madagascar, for example. Yes there are banks which will exchange approved currencies, but that's one step removed from being paid in a global global currency as you imply.