Does deleting a computer in 0patch Central remove 0patch Agent from the computer?

No, 0patch Agent remains on the computer after you have deleted the computer in 0patch Central, but is no longer able to sync, which means it's not receiving patches anymore and cannot be centrally managed via 0patch Central. You have to uninstall 0patch Agent from the computer manually or using the same mechanism you had used previously to install it.

If you wish to use 0patch again on a computer that was deleted in 0patch Central, it's best to uninstall and re-install 0patch Agent.