Actually, I think that they dumbed down the SAT, LSAT and AFQT to specifically eliminate the correlation with IQ. I do not believe that the scores NOW, at least, have anything like the correlation with IQ that they did in the 70's.
My understanding of the SAT is that they eliminated the g-loaded analogy section, and introduced a subjectively-graded essay section, and this led to increased deviation between SAT scores and IQ.
The AFQT has never correlated well to IQ for takers who don't test right out of high school, because it's normed for that population, for obvious reasons. If the same person took the test 10 years later, their score would go down, regardless of any changes in ability.
The way the AFQT is calculated has changed over time as the test has evolved, so you can't compare historical AFQT scores against each other. However, I'm not aware of any changes to the test that make it less likely to parallel IQ scores for its target audience.
