Yes, because only top-level browsing contexts are getting replaced. Also the summary of the bug still doesn't include that the requested unique id is for top-level browsing contexts only. So to be clear we need an id that is stable and can reference any kind of browsing context while it's alive.
Bug 1837031 Comment 4 Edit History
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Yes, because only top-level browsing contexts are getting replaced. Also the summary of the bug still doesn't include that the requested unique id is for top-level browsing contexts only. So to be clear we need an id that is stable and can reference any kind of browsing context while the tab or a frame is alive.