No, I think Amir is suggesting something different here.
I suspect what Amir is saying is that some successful people attribute their success to one thing, but that may not be the actual reason.
As an example - where the successful person has been clever enough to recognise their initial hypothesis for their success may have had flaws - many early Paul Graham essays credited the success of his Viaweb startup to the use of Lisp[1], while now most of his advice doesn't touch on a specific technology stack at all[2].
From my experience the things successful people credit for their success are infrequently wrong, but very often incomplete.
I suspect what Amir is saying is that some successful people attribute their success to one thing, but that may not be the actual reason.
As an example - where the successful person has been clever enough to recognise their initial hypothesis for their success may have had flaws - many early Paul Graham essays credited the success of his Viaweb startup to the use of Lisp[1], while now most of his advice doesn't touch on a specific technology stack at all[2].
From my experience the things successful people credit for their success are infrequently wrong, but very often incomplete.
[1] eg, http://www.paulgraham.com/avg.html (from 2001)
[2] eg http://www.paulgraham.com/ds.html (2013)