Let's see if they had the antibodies? Maybe they were "experimenting" with these folks.
What is important is the breakout cases, not underlying conditions.
“Twenty of the 26 COVID-positive residents and four of 18 COVID-positive healthcare personnel had received both doses of the Pfizer-BioNTech two-shot coronavirus vaccine at on-site clinics January 10 and 31, a full month before the outbreak on March 1, making them “breakthrough” vaccinated cases of COVID.”
This point is discussed extensively here: https://www.youtube.com/watch?v=BNyAovuUxro