The new QVL list on the Z370-E doesn't make any sense. It's called "4DIMM_memory_QVL_report" but it still lists kits that doesn't support 4 dimms and leave out some kits that did support 4 dimms on the older QVL report. Also, how they tested 8 x 16GB of memory on a board with 4 dimm slots I have no idea.
And yeah, the new report is missing 4000mhz all together, also jumps from 3000 to 3866mhz skipping all inbetween.
At this point I have no idea what Asus is doing.