The more I think about this, the more I feel this is bad advice, if indeed it was intended as advice. The author clearly is entitled to run her financial life any way she wants. My problems with what she is doing are as follows.
If she has "enough" now to meet her needs for the rest of her life while essentially having no growth in her portfolio, that means that she has over saved by any measure that would include a reasonable (~50%) amount of stocks. Over saved means you spent more years of your life working than you needed to. This is not a win in my book.
If she was okay with 60% stock allocation yesterday, then why is that not okay today? Conversely, if she needs 0% stocks today to be comfortable with the future, that would imply that her previous allocation of 60% stocks was too high to match her true risk tolerance. It just doesn't add up.