First of all it only says Palpatine looks doomed he may not be. Secondly, there may have been factors why Yoda decided to leap from the Podium, perhaps Sidious's lightning was to strong for Yoda to block with his saber afterall he loses his lightsaber to the lightning later on. Thirdly, it fits in perfectly with the movie, hell we see Yoda leaping down from the Chancellor's Podium. And finally, it's canon whether you like it or not and can not simply be dismissed.
__________________ Recently Produced and Distributed Young but High-Ranking Political Figure of Royal Ancestry within the Modern American Town Affectionately Referred To as Bel-Air.
He clearly wasn't, otherwise he would have died. But that has nothing to do with the fact that, according to script, Palpatine was losing at this particular part of the duel.
And yet none of those are mentioned in the script. None.
...And Sidious is already half a mile away, flinging pods, so it doesn't fit with the movie.
Wrong, it isn't canon. And if my word alone isn't good enough (which it is), there's the simple fact that it doesn't fit in with the rest of the movie, script, or novelization.