You’re arguing against a strawman. Fanon was a resistance fighter that successfully helped Algeria overthrow the French in a progressive nationalist movement against colonialism, not a simple theoretician that never engaged with practice. For Vietnam, the effects of liberating from France and adopting socialism as the mode of production both contributed to their success. The era of national divisions eroding is something for after the end of imperialism, in the meantime a people should be able to chart their own course free from the domination of the west.