That’s a fangames site, right? There are people still using SCUMM to make their own games. Unless one of them has cobbled some sort of interface between Z/Glu, I still don’t imagine that they would have even considered this natively.
Do they have a forum over there? Why don’t you ask them?
It sounds like they are suggesting that success in making a graphic adventure game means understanding how they work, and prototyping in a parser format is a good way to get started.
Not entirely apropos of what you’re asking, but the Gargoyle family of libraries (allowing play of many amateur IF formats and several historical commercial ones) has been added to a fork of SCUMMVM entitled SCUMMVM-MISC (after text adventures, unlike Lands of Lore, were determined to be outside SCUMMVM’s scope).