Electricity was discovered around 600 bc, electric eels weren’t discovered til the 1740s (named in 1766). Natives in South America likely interacted with them, but we don’t have any records of what they called them. Most likely though we would’ve named them something to do with lightning if we hadn’t figured out electricity when we found them.
https://a-z-animals.com/blog/discover-what-electric-eels-called-before-electricity/
Unfortunately, your article was pretty lazily written. IDK how they even got away with it. It took me about 5 seconds of googling to find that indigenous people in Venezuela called them “Arimna” or “something that deprives you of motion.”
https://www.theatlantic.com/science/archive/2019/09/electric-eel-three-species-what-a-shock/597709/
Are you suggesting a blog posted on a-z-animals.com is not a reliable source for facts??
Shocked. I’m absolutely shocked.