...and #REDIRECT the old pages.
e.g. https://www.mediawiki.org/wiki/Core_Platform_Team/Initiatives should be under https://www.mediawiki.org/wiki/Platform_Engineering_Team/Initiatives
Also, some product owner information is outdated, e.g. on https://www.mediawiki.org/wiki/Core_Platform_Team/Initiatives/Sunsetting_RESTBase