True, and this sounds very cool.

But might it just be easier to develop and apply similar sugar adhesives, or other compatible or soluble adhesives (in quantities that will not affect the recycling process)?

OFC, if you never introduce anything new, it is easier to feel like it is a "pure" process. Yet, what says the heat treatment isn't actually creating new molecules that could be recycling-incompatible, even though they never "add" any new material?