The only thing this does is further radicalize right wing entities. It will do the opposite of the intended effect. Instead of explaining thoroughly the problems and inconsistencies of a radical ideology, the EU has taken the approach of trying to whitewash it, which further cements the underdog mentality of many actual ethnonationalists and validates their stances in their own minds. Constructive dialogue about these things is not happening where it needs to happen, probably because it would require more honesty than most corporate or governmental entities are capable of.
Deconstruct their ideas, not censor their means of distributing them. Certain factions within the EU have been playing a dangerous game with public opinion for several years now. The equivalent of dropping propane tanks off of a plane into a forest fire.