It's one of my red-light issues when uncased pipe tobacco is discussed. That, along with pipe tobacco being somehow more "natural" (and therefore practically a health food - how we love to delude ourselves) than cigarette tobacco. (OK - It may have one or two fewer specific additives but latching on to that is patently ridiculous. "I only shoot myself in the head with a very slightly smaller calibre round. That makes me virtuous and safe." [OK - I also aim slightly off-centre as I don't inhale pipes])
All pipe tobacco is cased. It would be unsmokeable otherwise. There may be a very few exceptions like Belgian Semois - although I only have the Internet's word on that and we all know how reliable that is. The casing may be quite light and "unflavoured", i.e. a simple sugar solution, but cased it will be.
Even my old favourite, Edgeworth Sliced, which I naively took to be "straight tobacco" for years, was cased. I was knowledgeably discussing tobaccos in (I think) JJ Fox with an old duffer when the "purity" of Edgeworth came up. He smiled and told me "Of course it's cased. Everything is."
BTW - Nice review.