Führer might only mean leader in Germany, but it’s rarely outside of refering to Hitler nowadays.

Leader, in modern German, would be translated as “Anführer”, mit “Führer” specifically because of the connotations. Also, using the term fuhrer in English, instead of translating as leader, clearly means it’s being used as a title, rather than a factual descriptor of what he was.

You can use Führer in context, but as it’s a title that was specifically created by and for Hitler, and never used before or since, it’s generally not used as a title for Titler, because people don’t want to give him the post mortem respect of addressing him by this title.

And for context, the entire German language Wikipedia entry of Hitler, calls Hitler Führer a total of 17 times. 8 of those are in direct quotes, 3 in indirect quotes, 2 of them are describing his official title, 2 use the literal meaning of “leader” in the context of the party, NOT his title as dictator, 2 of them are talking about how he saw himself, and one is drawing a linguistic analogous link between “Führer” and “Geführten” (Leader and Followers).

Outside of quotes, there is not a single use of the term “Der Führer” as an actual honorific title (“The Führer”) in the entire German language wiki page.