Given that it is the intention to give the date of death at retirement and the article refers to scenarios well before retirement, I cannot see the point of either figure being of benefit, or to be relied upon with any accuracy.
The only way to achieve a somewhat dubious figure with some degree of accuracy is by feeding in to the equation your personal health circumstances. Doing this for the entire retirement population is therefore unrealistic.
DPB Independent Financial Services
Edgware, North London