The way that I understand sandwich construction, this method incorporates glass that is considered a structual glass over a form or shape, that without it would not be sea worthy. The strength is acquired by the seperation of the laminates, but requires both the core and the glass to make it sea worthy. This will need proper engineering.
When the use of a coating glass only, such as a finishing cloth, only, the hull needs to have the ability to stand alone, if chosen to forgo anything other than a coating for resisting abrasion in most cases. The finishing glass, with the resins, will help in the cosmetic part and seals out water, as a bonus. The way that I understand it for small canoes and kayaks, the shape will help just finishing cloth become some structual part of the hull. I do not beiieve that builders use only finishing cloth in larger hulls to gain strength and rarely will decrease hull thickness and depend on this type of glass to make up for the reduction in the scantlings.
I do think a stitch and glue hull's main advantage is this method eliminates framing as a way to save weight and gain interior space that eliminates the heavy timbers and the abundance of heavy fasteners.
In some conversations there may be some innocent confusion or just some oversight with terminology. This can be seen with people in different parts of the country, and may be the case here.