The footage and audio shows us what is being played, so it's not really a matter of opinion.
LRR is definitely played using open G because when Brian slides up to the 12 fret and when he hits the high e string it puts out a d note, he also slides up to the 17th fret for the high G etc etc.
To play what is heard, but tuned to standard would require some weird playing by Brian, but the
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