If your account is logged in on another device, it will be logged out of your current device. It is kind of security layer by the forum and it means no change that two people can login on a same account at the same time. One in, and one out automatically and it nearly means that if hacker logs in your account, you will be kicked out and will have to be very fast to log in again and change your password. It's nearly impossible to be informed and response in real time like this.

So having staked Bitcoin address, signed message, PGP key and PGP message are all good preparations for your account recovery later.