For me the "offspring of Anakin Skywalker" line comes down to it being way too descriptive, as if (a) Vader doesn't know who Luke is and (b) Vader doesn't know who he was/is (even worse in the rest of the 04SE). They both play way too dumb through the whole thing and it doesn't come off as a brave deception on either part, it just seems dumb to me. And its almost like they pause the movie for this revelation we've had since the opening crawl. Why does the Emperor call him in the middle of an asteroid field to tell him that the person he's been hunting for 3 years is dangerous and probably shouldn't become a Jedi?

No matter, it needs to be reverted back to as close to the original dialog as possible, which Ady is doing/has done. No more deception/Ric Olie worthy dialog ("Luke blew up the Death Star and you've been looking for him!") than originally there.