It has been unmaintained for over five years, apparently. The former maintainer approves this; see https://invent.kde.org/libraries/phonon-gstreamer/-/issues/1#note_564862
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We archive projects in place now (unmaintained was a classification for all the old projects which were marked 'unmaintained' prior to the Gitlab move).
I've now archived phonon-gstreamer as requested.