clayd333 shares the following email from the Westin Times Square (that I have since verified that others who booked the rate have received as well):
Dear Westin New York Guest:
Thank you for choosing The Westin New York at Times Square.
Our records indicate that you have booked the Renew Your Soul package for your upcoming stay.
Please be advised that this special offer is limited to single occupancy and is valid for the dates confirmed at time of booking. Any changes in dates, number of occupants or room type will result in a rate change and render the $60.00 rate null and void in accordance with hotel room modification policy.
For assistance or for more information, please contact us at firstname.lastname@example.org or call 212-201-4649 and select option 5.
The Westin New York at Times Square
So as I had predicted:
[T]his only comes up when searching for 1 person per room. If this is ultimately honored (don’t buy non-refundable airfare just yet!) then they well could enforce the one person per room limit. So if you are two people, you might want to book two rooms as a precaution.
Congratulations to everyone getting to stay in a prime New York City location for only $60 plus tax per night. And remember you’ll also get a $10 minibar credit, an in-room movie, a $10 Metrocard, and a $10 coffee card.