There is a way to make aluminum without electricity, it just requires VERY high temperatures, is rather low yield by comparison, and will inevitably produce aluminum contaminated with a few percent sodium and/or potassium. I am yet to see an analysis of reputed ancient aluminum artifacts that is inconsistent with this possibility.

I have also seen persuasive arguments that the ancient Chinese aluminum artifacts are likely the result of some brilliant Chinese alchemists who figured out the high-temperature process downstream of the unique properties of the technologies of Chinese ceramics.