Key to pellar's basement

Key to pellar's basement is a cut content key and quest item in , still present in the game files, but only obtainable through console commands.
It is unknown what it was supposed to unlock and there is no basement even remotely close to any of the Pellar's possible locations, locked or not. Even more oddly, its item ID suggests a link with the quest Return to Crookback Bog, which he has no involvement in. The most logical conjecture would be that it had been planned at some point for the Pellar to at least attempt to cure Anna Strenger.
Category:The Witcher 3 quest items
Category:The Witcher 3 keys
Category:The Witcher 3 cut content