Trying to summarize the answers to this point:

I think 'Tip Stall' is misunderstood and mis-applied by most modelers. Certainly by me -----which is the reason for the question.

To the experts, it is a set of circumstances leading to the stall of a wing panel (or one wing) beginning at the tip. This 'local stall' is very closely followed by the stall of the full panel resulting in the rather violent snap. The whole panel stalls but since it was induced by the tip we have the 'Tip Stall' label.

Is that a fair summation?