Yes, you are a troll. You manage to support a claim for niggardly being "officially insulting and racist nowadays" by quoting a Wikipedia article that is named "Controversies about...". If you're so keen on cleaning the English language from all politically incorrect terms, you better start checking the definition of "controversy". It's far from "official".
And the Wikipedia article you quoted just says the same as Charlie's article: "niggardly" comes from Old Norse and has nothing to do with all racist terms derived from the latin
negro, black. The only issue with "niggardly" is that is sound similar to "nigger" and that people are ignorant.
Also, this is not a forum for social justice fights IMO, there are place where your troll would be way better welcomed.