Even the furthest of the alt-right take their goal as the exact opposite: to break the control of the "cathedral" of left-globalist interests, who are embodied in the now-unified elites of academia, entertainment, high finance, big tech, wealthy industrialists, Democrats, journalists and media, and the unelected deep state.
The term "reconcentration" also makes it sounds like power was concentrated before. Except it wasn't. In decades past, several of the factions listed above were at ideological odds. Their unification under the shaming-enforced dogma of social justice and identitarian victimology is a new thing and is part of what people are fighting against.
Also consider government powers are ever-expanding over new domains of life, and being ever-concentrated upwards towards the federal level. Being against concentration of power is firmly a right-wing position at this point.
On the other hand, leftists - like the people who laud Atwood's book in your way - always want concentration of power because they're utopians who think that all you need to make a great society is more control given to the correct, enlightened technocrats (who always happen to be people resembling themselves in values, outlook, and opinions).
The sad thing is that an outcome like Atwood paints in her book is definitely possible from all this. But it won't happen after the free-speech and power-deconcentrating right succeeds; it'll happen after they fail, because the next reaction will be much much worse.