It appears someone has set up a fake listing for Escape From Tarkov on Steam.
This has not been confirmed to be legitimate by BSG.
DO NOT purchase it unless there is an official announcement. BSG have confirmed this was not listed by them and is a scam/ fake listing
Please see this thread for the original post and some more information
Edit: Someone from BSG just dmed me: "It's known, and we're already in talks with Steam to try to take it down."
reposting due to typo in title