An alternative, as I can't find many examples of "muzhikism/mujikism", apart from a few texts translated from Spanish, all from Mariátegui. There is no doubt that "mujik" and its alternatives exist, but "mujikismo" is not very popular. I think it refers to the idealization of the "mujik" in literature.

This is a translation from Spanish, but explains the concept.
"This indigenism, which is in germination and still needs time to flower and bear fruit, might be compared—allowing for all differences in time and space—with the “muzhikism” of pre-revolutionary Russian literature. Muzhikism was bound up with the first phase of social unrest that prepared and incubated the Russian revolution. Muzhikist literature performed a historical mission by putting Russian feudalism on trial and condemning it with no possibility of appeal. The muzhikist novel and poetry were prodromes in the socialization of land as carried out by the Bolshevik revolution. It does not matter that the Russian novelist and poet had no thought of socialization when they portrayed the muzhik, nor does it matter whether they caricatured or idealized him."
https://www.marxists.org/archive/mariateg/works/7-interpreti...

memory and mythmaking: post- emancipation - Carolina Digital ...
https://cdr.lib.unc.edu/indexablecontent/uuid:f5efe215-5d62-...
LEO TOLSTOY AND THE IDEALIZATION OF THE RUSSIAN PEASANT. No Russian noble did more to promote and spread the Peasant myth than Leo. Tolstoy.

A People Passing Rude - 11. Stephen Graham and Russian ...
books.openedition.org/obp/1579
... 'probably more responsible than anyone else in this country for the cult of Holy Russia and the idealization of the Russian peasant that was beginning to make ...