Not sure if that's fake or what, but it's pretty well established that the actual line is "No, I am your father". Even Lucasfilm acknowledge this, so if you want to argue that everybody else is wrong, I hope you have some serious evidence to back that up.

But ironically, the line is often misquoted: “Luke, I am your father.” In fact, Vader responds to Luke’s claim that he’d killed the young man’s father. “No,” the villain says, “I am your father.”

https://www.lucasfilm.com/news/defining-moments-i-am-your-fa...

Reminds me of a similar misunderstanding in Casablanca, where most people quote the line as "Play it again, Sam". In actual fact, the lines in the film are "Play it once Sam, for old times sake." "Play it, Sam." and "Play it again" (without Sam).

Another very well known misquote is "Beam me up, Scotty".

The sound in that clip was doctored. One of the comments mentions from which other part of the film the word Luke is clipped from.