I pretty much shared my thoughts on this a couple of days ago. I think this take on the matter is glossing over something really significant:

It’s possible to believe that Labor’s policy of Caucus solidarity has existed for almost 150 years, and she knew the rules when she joined the Party.

What was Labor’s stated position on the matter of Palestinian statehood when Senator Payman joined the party?
(That’s rhetorical, we all know the answer)