The bigger issue with the ‘Leia as other hope’ thing is the fact that she simply couldn’t have been an option at the time of Yoda’s original declaration in ESB. When Yoda said “there is another”, Luke was flying off to Bespin to rescue Leia - the same Leia whose fate Yoda could not see and who Yoda had just encouraged Luke to sacrifice for the greater good. She simply wasn’t an option at that point, sister or no.
Great catch. Yoda does basically want Luke to sacrifice his friends for the greater good and stay on Dagobah to finish his Jedi training. Yoda pulled his line of, “There is another.” directly out of his green ass.