Listen to this.
https://www.youtube.com/watch?v=h4OD2iDljrI&t=69s
Now that sounds Like Vader and it’s not Vader but it is James Earl Jones.
Kind of an odd excerpt you chose. He just growls.
However, earlier in the video, he really does sound like Vader.
https://youtu.be/h4OD2iDljrI?t=13I think James Earl Jones just doesn’t have the same punch in his voice any more due to his age. That Stargate clip is after all 20 years old, so his voice sound much closer to Vader in the OT.
He forget how shakespere Vader was 😃
It may just be pronunciation more than anything else.