If not ad-hominum, what is it then? I mean, you did not provide any substantiated reason why would their research be false but you went straight to pin-point their experience, or lack thereof.
FWIW I find this research to align on my thoughts about the IQ - IQ is not a constant but a function of multiple variables, where one of the variables is most likely an education.
For instance, I am pretty sure that drilling through the abstract mathematical and hard engineering problems to some extent during the high-school but much more during and after the University, develops your brain in such a way that you become not only more knowledgeable in terms of memorizing things but develops your brain so that it can reason about and anticipate things that you couldn't possibly do before.
FWIW I find this research to align on my thoughts about the IQ - IQ is not a constant but a function of multiple variables, where one of the variables is most likely an education.
For instance, I am pretty sure that drilling through the abstract mathematical and hard engineering problems to some extent during the high-school but much more during and after the University, develops your brain in such a way that you become not only more knowledgeable in terms of memorizing things but develops your brain so that it can reason about and anticipate things that you couldn't possibly do before.