On the Adox website it is claimed that CMS 20 II has 500mp equivalent resolution and that 90" prints are essentially grainless. Confusingly they also claim up to 800 lp/mm which would equal 2.2 gigapixels.
In Henning Serger's forum posts he claims (without evidence) that CMS 20 II can resolve 240-260 lp/mm in the real world, which is about 234mp equivalent. He later goes on to claim (without evidence) that a drum scanner cannot recover all of the detail.
high-end-scans.de has a publicly available sample of Adox CMS 20 II scanned at 24,110 ppi.
https://www.high-end-scans.de/en/samples/dv09_adox_cms20_30/If the film could out resolve the scanner this would be equivalent to 778mp. So there is no question that whatever Serger's experience with a drum scanner (which one?), the HXY scanner does not limit film's resolution here. Whether Adox CMS 20 II can resolve 234mp or 500mp, the HXY scanner can resolve all of it. If CMS 20 II's resolution is actually 2.2gp, then we should see over 700mp of detail in the scan.
So does Adox CMS 20 II really have 234mp of detail? 500mp? More? Let's take a look and find out by comparing to another real world image, this time in digital.