No they are not. There exist brilliant people and monkeybrains across the whole population and thus the political spectrum. The ratios might be different, but I am pretty sure there exist some very smart neo-nazis
Put plainly, the average neo-Nazi is astonishingly, astonishingly stupid.
It definitely attracts people who are competent in technology and propaganda is sufficient numbers for the task being discussed, especially when as a mass movement it has (or is perceived to have) a position of power that advantage-seeking people want to exploit. If anything, the common perception that fascists are "astonishingly, astonishingly stupid" makes this more attractive for people who are both competent and also amoral opportunists (which do occur together, competence and moral virtue aren't particularly correlated.)