Hi there Brian,
Thanks for following-up on this!
I’ve tried this locally and I was able to import the event as you say, and when trying to update the event information I do see the ‘error’ you mention. I think this is the way it works, you can import an EventBrite public event, but you are not allowed to edit the information in it. That’s why the event gets updated in WordPress but cannot push the edits to the EventBrite Event.
One thing you can do here is to disconnect the synchronization with the ‘EventBrite Event’ (‘Leave this event associated with eventbrite.com?’ option under the tickets box in the event edit screen), the downside on this is that the ticket form will be removed as well.
Please let me know if this makes sense to you,
Best,
Nico