The original content referenced the old way it was being referenced. It was high quality content, but just didn't reference the correct/current wording anymore.
Look how stable ranking became for that query as soon as the page was updated. Literally the same day it was updated.
The content was updated to reflect the new wording in the title tag, in the on-page title (h1), and then when it was referenced throughout the content.
Quality was totally fine. The page just needed to reference the correct and current wording. Again, simple but powerful.
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