@Midget I misunderstood, I thought you were mentioning the linstor error and attempting to troubleshoot that. Reviewing the rest of your thread that is not the case.
You mentioned you attempted to burn down the XOSTOR and rebuild it. Here's the issue, your steps of burning down XOSTOR aren't complete.
Simplest method if you're okay with it, format all drives to no partitions, no data, on all of your XCP-ng hosts and rebuild XCP-ng Hosts from scratch from the ISO. Doing that will allow the ISO to build the storage as expected by XOSTOR.
Advanced method - If that seems too drastic a measure, you'll probably need to review the documentation within the Linstor project to find out how you fully remove the partially removed remnants. It involves deleting volume groups, logical groups, and manually removing some linstor components.