Yes you can, if you sync the commit to NVRAM before giving any external indication of success/failure, and don't leak through any side-channels. The CVE before

Yes you can, if you sync the commit to NVRAM before giving any external indication of success/failure, and don't leak through any side-channels. The CVE before demo'd by the famous youtube video was that you had a split second after failure was indicated where you could cut the power and keep the failure from being stored.