Imagine seeing someone use a bunch of long technical terms that you have no understanding of to explain the cause of something, and your conclusion is "This guy has no clue what he's doing". Is Fia stupid?
Have you ever dealt with a modern fraudster?
Those motherfuckers talk like they’ve got their own built-in Grammarly, throwing around jargon and obfuscating everything to either seem way more knowledgeable than they are or to make it look like they know what they’re talking about.
There's also the fact that he's using modern jargon that doesn't exist in their world while looking insecure of himself.
Imagine you're a modern doctor, and some dude shows up saying, "Yeah, I can cure people using Interpalantios and sectorea of fratagancies of the tomorrow fyuctus with the bilbarsh on the cratipat," while doing weird shit to your clients.
Obviously, I just made up a bunch of shitty ass random words that doesn’t exist or make sense—and that’s how Fia feels hearing the MC use terms she's never encountered before.