First tell me how anyone can "extant" anything.

No, extant means still existing.

Extant means: still in existence; not destroyed, lost, or extinct.

Extant literature refers to texts that have survived from the past to the present time. Extant literature can be divided into extant originalmanuscripts, copies of original manuscripts, quotations and paraphrases of passages of non-extant texts contained in other works, translations of non-extant texts into other languages, or, more recently, photocopies or digital copies of texts.

Extant is an adjective with to refer to someone or something that is still in existence or surviving.

I'm the only extant person on earth with my exact physical characteristics.