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Super Aereo yes it is true.A word of caution: the Spitfire Italiani book has some incorrect technical drawings (there never was a "B" wing of second type, for example) and the info on camo schemes is a bit outdated. In particular, there is no proof that any Mk.V in service with the Regia Aeronautics ever carried a Desert Scheme of DE/MS, but we know for certain that in 1945 those aircraft wore a version of the DFS, albeit in many cases with an apparently darker grey than the prescribed OG.
The Airframe & Miniature book also repeated the older info about these colours, IIRC, at least in its first edition.
If it can help, here is the link to the IWM video:Super Aereo yes it is true.
Your observation convinces me more and more to use DFS camouflage.
I've seen the IWM video and you can see the camouflage well.