No, the Flynn Effect is an observation that raw scores on "IQ tests" have increased over (a far too short period to be attributable to evolution) time and/but IQ is defined as having a median value of 100 . It is not an assumption that intelligence is a measurable metric (redundant) it is an observation that the metric is a shit metric -- particularly over time. It is explicitly a point against "IQ" as a valid and measurable metric.