I've seen it said elsewhere that Dream Souffle is 'Dublin Elaine' but again there is confusion between a trade designation and a cultivar name. If they write Dream Souffle TM then it is not a cultivar name it is a trademark. Many plants in the trade these days have a trade designation plus a cultivar name. Endless Summer hydrangeas come to mind. However those are generally written correctly with the trade designation followed by the actual cultivar name, e.g. Hydrangea Endless Summer ('Bailmer'). Unfortunately, the way some daylilies are represented is very confusing to purchasers. Dream Souffle should not be written with single quotes if it is only TM.
Edited to add, a patented (not trademarked) cultivar name is legitimate and there 's nothing the AHS can do. The AHS is the official registrar internationally for Hemerocallis and the primary purpose of registration is to avoid duplicate names. Unfortunately the plant patent system runs concurrently and independently, so duplicates happen. The trade designations just add to the confusion because many sellers and buyers do not understand the correct way of writing plant names.
