yes here is the blue post confirming the end date of shadowlands season 4
the wowhead page was written on october 11, 2023 and the end date was october 25, 2023.
Shadowlands Season 4 Ending on October 25th - Wowhead News
we had a full two weeks notice before the end of season 4 in shadowlands.
and if this season is to end at the start of the pre-patch, then we have less than a week without a concrete confirmation.