The various DNA testing companies often use different versions of the tree. Even though you have tested onto the same branch at multiple companies, that branch may be named differently at each. This can make it hard to Google for resources about your haplogroup.
It was the beginning of the 21st century. FamilyTreeDNA and Oxford Ancestors were just getting started. Use of the human male sex chromosome DNA, the Y-chromosome DNA, for population history research was taking off for academic researchers.