Yes, from what I’ve seen, I think that is a correct assessment. They had the carbon fibre “pressure hull” with titanium end caps, and a shroud around the outside, probably to help pretty it up, and hide wiring and protect from minor damage and such. Please don’t refrain from commenting, it’s how we learn more. I’ve always had an interest in submersibles even as a young one, so while I wished the Titan had survived, I think there were too many cowboy-style design decisions made, probably for economics rather than safety (obviously not the way to go at 4KM down).