The rating refers to the technical difficulty. Some kids will be fine with this at a much younger age.
Probably they got sick of complaints by parents saying their kid can’t make the model. This way when a 10 year old makes it the parents get to think that their child is gifted. Took me a good 8-9 hours to build, but wow, does it look good!
How much extra would that have cost them really?I think leaving him out is pretty stingy.