The opposite is true
Ld typically is an issue among those with normal or superior iq
The definition of an ld is an area of function such as reading or math that is much lower than expected, given one's overall iq. If IQ is low, then all areas of function are going to be affected, so ld is less likely. Someone with an IQ of 140 who can't read or do simple math has an specific learning problem--that's ld.