when an oil change is done every one to two years, I don't really think,
removing three bolts is worth talking about. it's just plastic.
.
Three bolts?.............errr & the rest !! Even with that ESC you have a further 9 torx screws!
Oh & that info re the german using the undertray from the "E" golf with the part number 5Q0 825 901 or 902 is utter rubbish.............!
E- Golf under tray for engine area is 5Q0 825 236P & is only a thin aerodynamic cover, abit for the whole engine area, so not a reinforced stone guard/skid pan.
The part number you quoted 5Q0 825 901 or 902 have all been superseded by 5Q0 825 902C which is circa £195 & requires two drop down brackets part 5Q0 825 921 & various bolts etc. The brackets are shown in the bottom of one of your photos. Total of 7 bolts & 8 torx screws to remove tray for servicing.
Basically looking through ETKA for MK7 golf & other MQB the factory codes to look for (P codes) are:-
P1SB Engine protection grille
P1SK Engine underside & stonechip guard
P1SL Underbody stonechip protection
However trying to get a list of what parts are included under each code for say a Golf is bloody difficult!
Anyway the part 5Q0 825 902C has all the above P codes, eg if your car has these P codes on the full spec list/sticker then it has these fitted. All of these three are not in the UK, only some are.
So I recon that they will just use these existing parts for the alltrak version & have decided to not do a metal version for eco reasons.
P.S re the E-golf, it has different undertrays (parts 5Q0 825 236P, 5QE 825 902B, 5QE 825 229B, 5QE 825 218C) & it would be unwise to use them as you will get too much heat soak into the cabin from the exhaust! Basically instead or two length ways covers between the front & rear wheels with a gap for the exhaust, the E-golf has two width ways covers which totally cover the whole area up, as it has no exhaust! There is also a bigger rear cover under the axle/boot...but of course it has no exhaust..which would be covered up!