Seriously, no sincere white supremacist genuinely thought Zelenskyy's administration was sympathetic to their cause. Neo-Nazis are Putinists through and through.
Their evidence of Nazism was Ukranians asserting a separate identity and language from Russia. It's tantamount to calling Native Americans Nazis for protesting forced assimilation.
The parallel is a whole lot easier to draw than "calling Native Americans Nazis for protesting forced assimilation". Being a neo Nazi group practically did Putin's propaganda for him.