Assuming the blanked out zone on the locker label has the "Type approval number" on it, thus it is the van's legal plate, then the van is limited to a 1724 kgs maximum mass.
If the dealer contracted to upgrade the van to 1800kgs, then up till now he has failed to do so. It becomes an issue covered by CRA 2015, if he fails to get that plate upgraded, or removed making another plate the legal plate.
What the axles and noseweight can take, are in themselves of no consequence re the maximum, unless their ratings are inadequate in achieving the Type approval maximum, which given the stated values they are not, they are well suited. The maker is under no dictate to offer a maximum that exploits all the individual maximums summed.
Edit: your latest post implies the "new sticker" has become the legal type approval plate; it now begs the question if where it is and its durability makes it legal as such, then I feel the locker plate needs to be removed as two differing plates with the same type approval, surely can't be legal or where would the authorities look?
All part of the utter stupidity this industry has made of it.