At this point, discussion to the contrary is just useless console war banter.
His statement was equally wrong to those trying to paint the PS5 in a negative light. The devs have no control over the clock speeds at all. The system dynamically adjusts by running a heuristic for estimated workload and feeding that into a SmartShift style controller which balances power to the GPU/CPU. This is done in a way to be replicable so there is not variance between units, which is a problem that happens when a temperature based heuristic is used instead.