As offload supports cold migrations of RDM disks we shouldn't flag this as critical during plan creation phase, I don't know if we can separate the logic for offload vs. vddk, just raising awareness. 

MTV 2.10
OCP 4.19

Always 

1. Create a VM with and RDM disk, in my case it was a virtual compatibility dependent disk.
2. Create a migration plan with said VM, notice the "critical concern"  RDM disks are not currently supported by Migration Toolkit for Virtualization. The VM cannot be migrated unless the RDM disks are removed. You can reattach them to the VM after migration.

Cold migration does work, thus the critical concern per RDM disk is invalid, ignore the "vm snapshot detected" this is expected as I was messing around.  

As we support offloading cold migrations of RDM disks, IMO this "critical concern" should be downgraded to "information concern" status.

We may also need to address thus during an inflight migration if it is mentioned there as well.