There is a myth in this story which can easily trip one up. The author relates a comment claiming that if you work after age 71 you will be giving all your work income away in taxes. Untrue, not even close.

For someone whose work income boosts their total retirement income to between $70K and $90K in retirement,  the marginal tax rate is around 40%. You get to keep about 60%. The marginal tax rate goes up to 50%+ if your income exceeds $200K but retirees with that level of income are few and very far between. 

Misinformation like this that is embedded in relevant stuff gives it a credibility it does not deserve. This story is likely to be used by some retirees, likely the mathematically challenged, to plan their lives, resulting in bad decisions