I'm old. I wrote many, many, many lines of JavaScript before jQuery ever existed, I know the difference very well. Nobody is confused.
Ignoring the fact that it clearly wasn't intended to be taken literally, "in 3 lines of JS" when speaking in the context of a team effort on a web application can be understood as "adding 3 additional lines to the source code." Context.
There's no need to be nasty and argumentative for no reason.