No it's not. My point is that "do the needful" is not a proper representation of Indian English, as the parent comment implied. There are a lot more pecularities that makes the dialect what it is, but people are just not aware of them (yet). A quick google search will tell you that.
"Howdy" seems like a successful synechdoche for American dialect to me. Seems like what makes something a proper representation is somewhat personal.
Not to derail the conversation more, but "howdy" is more of a southern American thing than just American. I never used that in the midwest/north until I moved to the south.
Yeah, I'm from the midwest and only would use it somewhat tongue in cheek or to mix things up. But most short-hands for American culture internationally seem to be focused on Southern/Western.