Here's what the T&C's say. I guess it depends upon the definition of a "full breakfast". Perhaps the two of you who stayed there recently could contact Hyatt and ask for clarification (as well as voice your complaint about the quality).

• Relax in the Club lounge with continental breakfast and evening hors d’oeuvres daily. Or, enjoy complimentary full breakfast daily for each registered guest (up to 2 adults and 2 children) at Hyatt hotels and resorts without a Club lounge.