If you do something like refer to all white people or all Germans as Nazis then yeah, in that context it’s a slur. But just referring to members of the Nazi party, definitely not. Extreme far right folks, personally no, I don’t view it as a slur there. Some people may disagree (probably the extreme far right people being called Nazis).
This was in November 2023. It may have just been that day or it may have changed since then.