I have worked in the hotel industry all my life, probably have come in contact with 10’s of thousands of people, and only known of two deaths while working at the hotels, both suicides.
I’ll bet that the hotels you worked at all had defibrillators, at least one per floor.
This is because SADS is enough of a killer that the government decided to mandate defibrillators. This is also the reason that people in the healthcare and related industries must learn CPR. (I even used CPR once to save a life when my son choked.)
The fact that you have never had to deal with a SADS death during your career only means that you were lucky. I have not been so lucky. I have known a few other cases in addition to the young woman I knew who suddenly collapsed dead. I worked at a hospital where an employee collapsed in an area where responders could not bring a crash cart. He died. Another time, a woman collapsed in the cafeteria but a crash cart came and took her away within a couple of minutes. I do not know if she survived. And several years ago, I was driving in Baltimore when a man collapsed on the sidewalk. I didn’t stop because people immediately ran to him, and I do not know the outcome.
My point is that heart disease deaths are relatively common and have always been relatively common. The fact that professional antivaxxers are now using an unfamiliar term for them and implying that they are related to vaccination does not mean that they are anything new.