I don't think that it is my role to review kit when group buy are handled by professional like mykeyboard.eu...
mykeyboard.eu servers as the vendor and proxy. They don't design the kits. The kit was designed and placed in IC for a long time.
GB's are not like buying a product in a store off the shelf unfortunately. Errors are frequently made by kit designers and it's up to the community members to catch them. When I go to an IC I look exactly which keys I want and if they're in the kit.
I agree with you that this is not ideal, and maybe there's goodwill and a possibility to get a replacement, but I wouldn't make the assumption.