I tend to agree with the article in general, which has implications that run counter to that piece of advice. Namely, that current success is not necessarily a predictor of future success.
Winning the lottery can lead to present success. Having one once, in a fair game (and that's a valid condition to check) is exceptionally unlikely to lead to future success.
OTOH, pursing a line of work in which you haven't yet succeeded, but others have, may be an area in which lack of present success doesn't preclude future success.
I tend to look to process with more emphasis than outcome.