No, it's not bricked. Bricking the device turns it into a literal paperweight - won't boot, won't turn on, won't do anything.
If you delete your OS, you install a custom recovery like TWRP and then move a new OS to your phone. Then you have to use the custom recovery to install the .zip file containing the OS. This can be done via ADB I think, but I'm not entirely sure about the process. I'm sure people at XDA would be able to help, though.
Hey, I might be late to answer but do you have TWRP on your phone? If yes then connect your phone to the PC & see if the phone is visible through ADB. If yes, then go to TWRP on your phone, search for ADB Sideload (or something like this), then click it. Then on PC, in the same command prompt do adb sideload .zip*(for example: adb sideload update.zip). The ROM should be now transferring to your phone