Reading Instance variables from scripts. (Does seem to be possible)

Yes, KM 8.0.3 provided us with script access on Oct 3:

And I posted the JXA access here:

But you're right, the KM Wiki does seem to need updating. I'll add that to my ToDo list.

However, the Wiki does correctly show how to access from JXA here:
Execute a JavaScript For Automation action (KM Wiki)

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