This has happened before, and I think many MEDLANDS links around Wikitree and the internet are already out of date.
Editors should try to remember when citing MEDLANDS to say when they checked it, because MEDLANDS changes often (also the information).
Even better, it is best when using MEDLANDS to read all the footnotes and report those as well, because these explain what MEDLANDS is really trying to explain, which are often attempts to guess, and frequently changed.