Rachel Elior, a professor of Jewish philosophy at the Hebrew University in Jerusalem, claims in a forthcoming study that not only were the 930 scrolls written by Jewish priests living in Jerusalem but that the Essenes as a sect did not exist.
I think Elior is over-reaching. Others have proposed that the Essenes had nothing to do with the scrolls or Qumran. But to suggest that, because they didn't write the scrolls means they never existed at all, seems way over the top. After all Philo, c 40 AD, Josephus c 93 AD and Pliny the Elder, before 79AD all mentioned the Essenes but Pliny never went there and his work seems to be primarily based on the work of Marcus Vipsanius Agrippa who drew maps and wrote about the region when he was governor of Syria....in 15 BC.
So suggesting some sort of conspiracy between three Greco- Roman writers who never knew each other and a 4th who flourished long before the other three were born seems to over-engineer the idea by an order of magnitude.