I'd say there is a 99.999% chance that RAID parameters detection will fail to detect the parameters of that array. In fact, I've never yet seen a RAID 6 that was auto detected personally. Let alone one with so many drives.
That's going to be a nightmare of a recovery, just FYI. Our pricing here to do it would be a minimum of $8,000, but very likely could end up being even more once we get a full measure of how difficult it'd be. RAID 6 is several layers of difficulty more complex than a RAID 5 is. We usually resort to studying the metadata stored on the drives to help determine things like drive order and stripe size. Takes a bit of reverse engineering and careful study, along with a good amount of experience to do successfully.
As to the de-duplication, that's really a moot point in my opinion. Once you have the RAID parameters, you can recover the entire volume as an image onto a new array volume and work with it just as before.