I agree completely: the current champ does look to be more than one stem at ground level. According to the American Forests standards, which the state registries should reflect, one should measure only the largest stem of such trees, not the whole mess. In reality tho, responsibility for the California Registry has changed hands many times in the past decade, and keeping measurement standards consistent over such a large state is hard to begin with.
Still, you should measure and submit that purrty tree: if the current champ dies or is DQ'ed then they'll look to the other nominations for a new champ.