Ordering the replacement MAF was a good idea assuming you have verified the wiring is in good shape. Otherwise VCDS is telling you the N18 valve isn't operating correctly and you should attend to it as it controls the EGR valve ... both are fairly common problems for BRM engines, unfortunately. I haven't done too reading on them (as I had an ALH and still have a BEW) but they seem to suffer from more issues of that kind than previous TDI engines.
I would read up on the BRM having MAF & EGR issues on TDIClub; you've got plenty of reading to do there.
You are entitled to your own opinion but not your own facts.
2006 VW Golf TDI - Frankenblend 5w40ish, HU726/2x, EaBP90
2012 Mazda 5 - M1 0W20, PL10241