[font=courier new]zulu-15.0.10-macosx_x86_64.jdk[/font] and [font=courier new]zulu-15.0.10-macosx_aarch64.jdk[/font] folders are just renamed folders. As the build procedure needs both x86-64 and arm JDKs, I had to rename [font=courier new]zulu-15.jdk[/font] folder.
By the way, take the [font=courier new]zulu-15.jdk[/font] folder found in Zulu tar.gz files at Azul, not dmg files.