This thread is resolved. Here is a description of the problem and solution.
Problem: Do I need WPML Translation Management plugin for Oxygen?
Solution: Yes, you do not need the Translation Management if you want to go to old school method: https://wpml.org/documentation/translating-your-contents/using-different-translation-editors-for-different-pages/
Thanks for the link. It made me realize that WPML’s Translation Management keeps track of changed translations (that it needs to be updated), so I don't go ol d school ;-).
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