Upgrades lately are dependant on rate type booked. The entertainment rates are least likely to be upgraded using the loews first card.
"Enjoy a free upgrade to a premium room, if one is available when you arrive."
This is listed for the loews first blue. I would call and ask what a premium room is at RPR. Also enquire what you would be entitled to using the rate you have booked. I know many have said they could upgrade if they first pay rack rate. Usually they offer upgrades willingly when asked at slower occupancy times.
In the end it seems to be luck of the draw many times. Not much has been consistent and nothing is in writing unless booking a non discounted rate. Good Luck!