Jason,
SYD-EZE-SYD is definitely restricted to 744ER only, mainly due to the performance required to get off the relatively short runways (3300m) in EZE with a decent payload.
MEL-LAX eastbound isn't a problem for non-ER aircraft, however the return sector LAX-MEL would be severely payload restricted and even subject to a tech stop in SYD if weather in MEL is marginal.
I'd imagine they'd swap aircraft in LAX so that OEB comes home via SYD or continues onto JFK perhaps.
Hope that clears it up.
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