There's certainly no full-scale Holocaust in Ukraine right now (though ethnic Russians were repressed by Kiev), but the current government upholds Stepan Bandera, nazi-collaborator, and Azov is a neo-nazi battalion, hence the comparison to the German Nazi party.

It's not an isolated incident. The head of the forced conscription service mentioned there are many other sites like it in Ukraine. There's also reporting going back to at least 2014 of similar operations being run by Azov in the western press.