I think he's just stating a fact that Dr Dan made a typo.
Leaving Israel is called yeridah. (There are sometimes valid reasons for it. No one should speculate about an individual case as there is no reason to).
Never heard of the word yeridah. I guess that is the correct term.
My intention is not to judge or draw conclusions. Indeed to call their deaths a tragedy is an understatement. Gd acts mysteriously and this terrible thing which happened reminds me of the story of joav.
I only pity the kind and for me to say, "oh they left israel for mid wood and Gd punished them," would be a cruel thing to say. Never be cruel to the kind.
However with few exceptions, to leave israel for the galut when one doesn't have to, is a tragedy in itself.
I do not judge the sasson family.