This is the switch's name as recorded specifically by this deletion task, which may be redundant with the name field but sourced from a different internal reference point. Comparing swName against name on this same task row is a sanity check that the task's two internal references to the target DVS agree; a mismatch would itself be a red flag that this deletion task's target got corrupted or overwritten mid-flight. Seeing swName and name disagree on the same deletion task row, e.g. one references an old switch name after a rename, would explain why the delete call keeps failing to find its target in vCenter.