It seems strange that he would make a tag wrong on purpose. Anyhow, just because info is on the CRG doesn't mean that it's the only way something could have been. So, instead of trying to tell the guy that he is wrong, why not ask him if he can make the tag you are looking for? Offer to share in the cost if you really want it badly.
What really bothers me is the parts/services vendors who are active with the CRG who make up the 'rules' about what is correct or not. Some of them base their 'rules' upon their opinions & what they have seen, but they certainly haven't seen everything. People will blindly believe them, and if someone tries to call them out on a mistake, well, I won't even go there.