Outrageous scammer using illegal way of providing offline games via new steam account. So no key is provided to add to your own Steam account! I'm sure Valve/Steam should do something about this since this scamster is using a method that should be banned/stopped.
This is what the seller requires you to do and is illegal.
ALLGames
Hello.
Follow the instructions to install the game:
1. Install Steam client (https://store.steampowered.com/about/Steam)
2. Log in to Steam using the received data (if you need a GUARD code to enter, contact me again in the chat).
Login - xxxxxxxx
Password - xxxxxxx
3. Download and install the desired game from Steam.
4. Run the game online for 1 minute and then exit.
5. Next Enter the offline game mode (upper left corner -> Steam -> Go Offline ..) and start the game again.
7. You can play.
! ATTENTION !
Dear Customer. Any changes to the account data (login / password) can lead to a COMPLETE loss of access to the game. Do not violate the rules and installation instructions! Thank you. Have a nice game.
Has the cheek so say do not violate the rules of installation but is running the scam.