The G-factor in IQ, even disregarding the discussion about how useful it is or isn't for humans, is not the only factor when considering non-humans.
An AI mind which can learn and intuit as well as an IQ 130 human (2σ, the tests become unreliable above that), but also comes with the speed difference between synapses and transistors (roughly the same as the difference between jogging and continental drift), has a chance to become expert at every subject.
Most of us have enough difficulty truly comprehending the domains of other single human experts; a human-upload with that much breadth of expertise will be incomprehensible by default even if they speak your language.
An AI mind which can learn and intuit as well as an IQ 130 human (2σ, the tests become unreliable above that), but also comes with the speed difference between synapses and transistors (roughly the same as the difference between jogging and continental drift), has a chance to become expert at every subject.
Most of us have enough difficulty truly comprehending the domains of other single human experts; a human-upload with that much breadth of expertise will be incomprehensible by default even if they speak your language.