Go to XDA and download the official ROM. Boot to Fastboot and Flash the OEM ROM and check if it helps. Did you take a backup from Recovery before flashing the Rog Phone 2 rom?
If you are unable to go to recovery or Fastboot, I think it's more than a hardbrick. Unfortunately I don't think the phone is in warranty. Asus isn't of much help. But please contact them post lockdown and get it reach a service center. Let me check for source.