I can confirm the same error.
System: Mac Pro 2013
OS: Going from Big Sur to Monterey.
Installer throws error and says to try again.
Aura Pro X2 Installed in Mac Pro.
Removed, replaced with Factory Original SSD, and upgraded from High Sierra to Monterey.
Screen flashed several times on reboot, indicating firmware upgrade was in progress.
Once installed, removed Factory Original SSD, reinstalled Aura Pro X2 SSD.
Boot, and ran Monterey installer.
Installer completes correctly. Posting from Monterey now.
I had the Monterey installer copied on an external drive, from which I ran it both times to do the install.
Something to note: I tried booting from the Factory Original SSD in an OWC external enclosure. This worked, and I was able to boot into High Sierra, and even activate the Monterey Installer that was on the other external enclosure.
My plan was to boot using the Factory Original SSD and tell the installer to install Monterey on the Aura Pro X2 (which was still installed in the Mac). However, the installer does not "see" the Aura Pro X2 like this (says it cannot read the drive), and it does not show as an option to select which drive to install to.
Hope this helps someone.