Hi Mo, I hope you're doing well!
The Linker Scripts used by the connectivity stacks (for example, BLE) use a custom syntax, and are automatically managed by MCUXpresso.
Because of the custom syntax, MCUXpresso seems to detect some errors in the file, but they do not cause issues during compilation, and the build should complete successfully.
Please let me know if you need any more information.
Best regards,
Sebastian