It's interesting that when looking up the reservation on DL, it shows the reservation with First (G). Additionally, when going to the seat selection on VS, it lists Upper Class, but then shows a seat selected in PE. When trying to select a seat in Y, it gives a "downgrade" message and won't let it be selected, however, when selecting a seat in Upper Class, the system allows it (though, as mentioned, this doesn't stick).
Lastly, the fare I booked (MIA-LHR) through PL is the exact same as the PE fare given when looking on the VS website directly. It would be an excellent deal if it were business (<$1k from MIA), but I'm not getting my hopes up.