Why would she mention countries that US has been fucking over for many decades trying to overthrow their government and whose people US sanctions starve in the context of supplying their weapons to Ukraine?

Because one of the foreign policy goals of the US in South America is to reduce Russia's and China's foothold there. That's been the case for decades, and has roots in the days of the Monroe Doctrine.

there is shame in writing comments on the subject you’re not familiar with

Thing is, I'm familiar with the US's relations with the governments of Cuba, Nicaragua, and Venezuela. They are, to put it mildly, poor. Meanwhile, their relationship with Russia is quite cozy. This is hardly a secret. That makes your claim utterly inane. It of course totally makes sense when I learned that the only source for the claim is off the cuff remarks from an official. Russia, Russian state media, and Venezuelan state media then ran with this narrative, despite it being bonkers. So hey, maybe don't claim to know vastly more than me when you're falling for stupid claims that are themselves based on a single statement.

If you want to keep arguing, feel free. But before you accuse me of being unwilling to admit to being incorrect, take a look at yourself. You keep defending a claim that the US would take actions that are nonsensical, and you're relying on scant evidence. Are you actually clinging to a falsehood?