A better way to put it is that WiMAX is on the 4G _roadmap_ but 4G spec hasn't been officially defined yet. It will probably require MIMO antenna use to be 4G, which WiMAX is capable of.
I guess they better change all their brochures and signage then... "Powered by WiMAX, a fourth generation (4G) wireless internet technology." right off the brochure..
