Xi's objective is simple, to convey to Australia if it followed US and attacked China during war with Taiwan, that would cross China's red line which means China will retaliate by military means and see it as a declaration of war. Just like in the Korean war, when China conveyed to the US not to go up to the Yalu River and the US ignored it, well they send 200k troops and everyone knows what happened after that.
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Albo's objective is simple, for China to lift the sanctions and buy more Australian stuff. There's no Australian red lines to be conveyed, because there are none, China has never crossed any Australia's red line that warrant a declaration of war.
