I don't believe so; I think most people know the difference.
It seems more likely to me that if could have been working at the behest of some Islamist group. Muslims have been in perpetual war with the Sikhs since their foundation; the depredations of Muslims forced the Sikhs to embrace the warrior ethic we admire them for.
There are plenty of connections between White Nazis and Islamist outposts in the West. It was suggested, seems probable actually, that they were involved with the Oklahoma City bombing.
I am of the same opinion. The MSM is incapable of reporting this possibility. It does not fit their marxist template. As pointed out above Marxism and Naziism are leftist movements with strong ties to Muslim extremism. Evidence for this is concrete and goes back at least 70 years.