> The synonyms he talks about are very similar e.g. a noun from "right" and a noun from "true".
If that's the case, I see where you're coming from. I was interpreting the meaning as similar to differences between "lie" and "bullshit" and "gaslight" in English. They all mean roughly "an untrue statement" but they still have their own nuances; "bullshitting" and "gaslighting" are just specific ways of "speaking untruths".
> Does this imply anything?
This does not imply to me that people who understand these words are bad or evil or anything like that. It suggests, instead, that they're used to being lied to in subtle ways such that they've developed tools for discussing these lies amongst each other in their native language. Similar to how citizens of English-speaking nations use words like "bullshit" and "gaslight".