You can review the source code here to verify.
OpenUtau for DiffSinger modified for LUNAI singers - keirokeer/OpenUtau-DiffSinger-Lunai
github.com
Actually, it appears this fork has already been merged into the main release of OpenUtau. You just need to change your preferences from stable to beta version to get any new features. The only remaining difference between the forks is the color scheme, which shouldn't affect voicebank compatibility.