I haven’t personally found it, but that number comes from here: https://www.etymonline.com/word/aura

Curious what you mean by recent use? It’s been in my vocabulary with that meaning for at least my entire adult life (~20 years). Maybe it’s just become a popular word with younger generations in the last few years?

Sure, “aura farming” might be a new saying, but the meaning of “aura” is not.

That meaning is 166 years old. The word itself is around 500 years old.

https://www.etymonline.com/word/aura

Well, “aura” is ~165 years old, so not sure if that counts as new slang.