I don’t understand this. Normally they don’t care if you move to a same fare seat.

Cover the body, and relocate surrounding passengers, if possible, if you can’t move the body to business class (moving a dead body respectfully is very hard).

Apparently there were free seats elsewhere, the pax should have been offered relocation. However it’s not clear if the passengers asked. The cabin crew could have been rattled too and forgot.

Edit: They apparently asked, I don’t see why they couldn’t move.