It was changed in version #9 by user Ardenne8: https://www.openstreetmap.org/way/120285921/history

The changeset summary page is here: https://www.openstreetmap.org/changeset/172613692 ← Joost had also left a comment about a missing source for some part of the changes.  Perhaps you can leave a comment too and explain why you think this power line is still active.  If Ardenne8 does not reply, we can undo the change and restore the tags as they were before.