Thank you for your alertness, @kirschwipfel!
Reading comments to the bug report, it turns out that:
Meanwhile, the #Framadate maintainer clarified that expired polls are not archived but actually deleted.
He admitted that the current wording in Framadate is unfortunate. /c
@datenteiler @Digitalcourage @Framasoft
Seems to be similar to dudle, which is provided by TU Dresden: https://dudle.inf.tu-dresden.de/anonymous/?lang=en
The version from #Digitalcorage looks a little bit nicer
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