Might've been overlooked by the system then, when the system got introduced it tried to automatically link GDers to their username if possible, could be that your username was already changed by then.
In this case you can simply message
a member of the NAT and ask them if they could link it to you, since you are the maker of the GD.
I did report a lot of mislinked ones to
pishifat after the linking system got added, so he should know how to add you to it.