> Personality isn't an internal property - it's a judgment made by people watching behavior.

Partly, yes, but personality is also an internal property, or it is coherent and correct enough to generally say that it has internal aspects. I.e. a person's personality is the set of (relatively) stable and difficult-to-change patterns that manifest in their behaviour in broad contexts, and these patterns are almost certainly encoded internally in the brain in some form. It is not much different than saying a person's intelligence / IQ is partly internal.

Otherwise, I do agree with your more careful framing, and I wish people thought and spoke more carefully about these things, and doubly so for LLMs.