Equal potential maybe. But it's nonsense to equate potential with talent. Talent is observed based on demonstrable execution.
A pithy quote is all that is.
Stephen F. Blinkhorn, a senior lecturer in psychology at the University of Hertfordshire, wrote that The Mismeasure of Man was "a masterpiece of propaganda" that selectively juxtaposed data to further a political agenda. [..] Jensen also criticized Gould for concentrating on long-disproven arguments (noting that 71% of the book's references preceded 1950), rather than addressing "anything currently regarded as important by scientists in the relevant fields"
No, we should disregard what he has to say because even his arguments against the century-old studies he attacks (while carefully avoiding modern work) were shown to be faulty. It's like (poorly) debunking phlogiston in the modern day, and expecting to be taken seriously.