The Mustafar shots are actually the work of the very talented Bradley Klein who provided the voice of Palpatine in the SW Theory Vader fan film.

Here is the source video.

https://www.youtube.com/watch?v=t6erKGMv3hU

His channel is listed in the description.

I wish I had those masking skills. I have wanted to do something like this concept clip in a TLJ edit for a long time, but the footage simply did not exist yet to make it believable.

Snooker, John, and others here could probably do a clip like this, but make it more convincing. My PC was not letting me make fine tuned cuts, but i hope it did not suck. lol

I don’t think you guys could hear the audio of senators shouting, but here is a breakdown of what’s in there audio video wise.

the Shots of Luke created by John.
audio of Andy Serkis from heavenly sword PS3 “with every age that comes to pass, there is one born to greatness…I am the one.”
Audio of Anakin’s dream vision from the ROTS edit: Shadows of the Empire.
Spliced audio of Han taken from the film Age of Adeline. “The Truth! You never told anyone?” Leia: No! It was Snoke"
Audio of Senators in an Uproar taken from AOTC deleted scenes.
Spliced audio of Snoke saying Vader
Footage from the Vader VS Kylo Ren fan film.