Well, right now I am retired by his definition (if you include dividends as equivalent to interest). However I will be spending more than interest on the day when I buy my dream home later this summer, since I prefer to pay for it in cash. So, maybe on that day I won't be retired. But then after that, with a smaller nestegg, I will still be retired by his definition.
But, I find that different members here have vastly different definitions of retirement.
To me, being retired means that you don't work at all any more and won't ever have to work again. But many of our members choose to work, often at some easier job, just to keep busy. And if they feel retired, who am I to contradict that? It's helpful to try to keep an open mind about the definition of retirement.