It’s a good news, it’s worth not to give up early. 
Like I tried to said since beginning: with a recent bootloader + kernel versions, additional settings are not needed anymore and should be used for troubleshooting purposes only.
PS: After I have seen this photo: WD SN580 NVME installation on the ONE V3
I’m not surprised that the WD SN850X doesn’t work with the NEO 5. 3.3 VDC * 2 A = 6.6W. The flexible circuit board (cable) only supports a maximum current of 5 W.