On LineageOS 23.2, faking a locked bootloader is not officially supported or recommended. LineageOS does not provide a built-in way to spoof the bootloader lock status, as this would involve lying about security features, which is not their policy. Some devices pass their bootloader unlock status to the Android kernel during boot, and LineageOS does not remove or alter these flags. This means that if your bootloader is unlocked, the system will still report it as such, and there is no official method to fake a locked state on pre-compiled/official LineageOS buildswiki.lineageos.org.

However, there are community workarounds for specific devices:

• For some devices (like certain OnePlus or Pixel models), users have successfully relocked the bootloader by compiling LineageOS from source and signing it with their own keys. This allows the bootloader to verify the custom ROM as legitimate, but this is advanced, device-specific, and carries risks like bricking your devicexdaforums.com+1.
• There are also reports of users modifying the bootloader or using custom recoveries to bypass the unlock warning, but these methods are not widely supported and can be dangerousreddit.com+1.

Summary: For most users, especially on official LineageOS builds, faking a locked bootloader is not possible without deep technical modifications. If your goal is to pass SafetyNet or similar checks, consider alternatives like Magisk modules for hiding root status, but note that bootloader unlock status is often still detectable.

Would you like guidance on a specific device or alternative approaches?