Its not corruption, its a function of the test. Prior charts as posted are graphed on IOPS vs queue depth. The new charting method charts IOPS versus latency. With consumer drives as they get overloaded, latency spikes up and IOPS will actually pull back, causing the swinging motions. These are charted with VDbenches curve profile. unrestricted workload starts, measuring the "100%" performance of the drive, then it scales from 10-120%, plotting the bathtub profile up to and through peak saturation. Some drives peak more gracefully than others.
Drive models that have very smooth and predictable lines are generally the highest performing. Drives that get bogged down and go nuts are the ones that lag on performance. For QLC drives we are actually working on an even smaller subset of tested drive surface to allow the drive to better cope with the workload. Those will be coming out soon.