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...

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.