It was inspired by Wakui's work, and attempts to produce a similar glow/bloom to highlights in an image, which it sort of achieves. The overall color grading could be pushed further, but the author wasn't looking to exactly match the style.
It should be noted that the project CIMG/GMIC is _not_ built and billed as an IM alternative. It's an image processing framework that happens to have similar utility to IM for some folks and that is also available as a plug-in to GIMP for visual+interactive use.
As a single _example_ of one (of many) possible interfaces for it? Seems to hardly qualify as 'billing' as much as one example of how it might be used...
I'm my experience it has been the only plugin to help Gimp fill in the space of the advanced features Photoshop users enjoy such as Content Aware Fill.
The Resynthesizer plugin (Heal Selection, Heal Transparency) and Liquid Rescale work well as alternatives to the Content Aware system, in my experience.