nowhere have I "claimed" an "innate deficiency" of intelligence in blacks. My position on this question is clearly spelled out in my most recent book: "The plain fact is that at present there exists no scientifically satisfactory explanation for the differences between the IQ distributions in the black and white populations. The only genuine consensus among well-informed scientists on this topic is that the cause of the difference remains an open question."
https://en.wikipedia.org/wiki/Arthur_Jensen#Criticism
I believe the largest cause of lower black IQ is kike propaganda directed at black people encouraging them to blame the white man and demand free stuff from White men instead of trying to succeed by actions other than blaming the White man. And not being told that it is the White looking kikes that keep them down when the White man is blamed
There might still be an IQ difference but the difference would be much less without such propaganda because they might try to study
Adopted twin studies do not prove that because both black twins go to public schools that tell them to blame the white man and watch TV that tells them to blame the white man whether they are adopted by white or black parents
Both twins share the primary causal factor of low black IQ which is propaganda to blame the white man
So we need to have two identical twins and one is told that the Kikes were primarily to blame for the trans Atlantic slave trade and that they own the rap music industry and the other is to be told that White people are to blame for black people's problems and we should see if one twin has a higher IQ than the other twin
England has propaganda to blame white people instead of acknowledging the truth about Jews
So that still does not rule out the common factor of blaming white people for black problems as the primary cause of lower black IQ instead of Genetics as the primary cause