Yes, their website has a link to the cruises being offered as part of this deal. The offer is only good for 5 days.
https://www.cunard.com/en-us/the-cunard-experience/solo-travellers
Terms & Conditions (copied from their website):
Taxes, Fees and Port Expenses ranging from $60 to $725 per person are additional and subject to change.
*New Single Occupancy Bookings only. Up to additional 25% off the single supplemental fare reducing the supplemental from 175% of the double occupancy fare down to 132% of the double occupancy fare. Additional discount ranges from 14% to 25% and varies by voyage. This offer is not combinable with, but not limited to, Past Guest offers, Flash, Interline, Travel Agent rates, recipient only offers, negotiated rates/offers, and travel agency exclusive offers. This offer is capacity controlled and subject to change. Offer is available to residents of the 50 United States, Canada, Bermuda, Puerto Rico, Mexico and the District of Columbia who are 21 years of age and older. Fares quoted in U.S. Dollars. This offer expires March 5, 2023 Promotion code Z2G.