So I am running into the same problem now, with public documentation:
https://www.nxp.com/docs/en/user-guide/LLDPUG_RevL6.1.22_2.0.0.pdf
Following the instructions from chapter 4.5 leads to this problem. I see why this is the case, i.e. the mentioned "meta-nxp-desktop" layer is not enabled by default. Instead, the "setup-env" script suggests building "fsl-image-networking" or "fsl-image-networking-full".
So I manually enabled the layer and bitbake starts running, but fails with this error:
ERROR: ParseError at /media/dzu/hd01-xfs/nxp/yocto-sdk-6.1.22-2.0.0/sources/meta-nxp-desktop/recipes-graphics/libgpuperfcnt/libgpuperfcnt_6.4.11.p1.2.1d.bb:8: Could not inherit file classes/fsl-eula-unpack2.bbclass
ERROR: Parsing halted due to errors, see error messages above
So I believe there are multiple problems here that need fixing by NXP, correct?