That's a great question, and it took me a bit of thought before I could offer an answer. Here's my proposed answer: A corpus-informed language means a language created or shaped with an understanding of the corpus. So "X-informed" can be read as "created or shaped with an understanding of X". For example, an environmentally-informed approach to waste disposal would mean an approach to waste disposal that was created or shaped with an awareness of environmental factors, in other words, an environmentally friendly approach to waste disposal. I hope that helps and I look forward to seeing any thoughts others may wish to contribute as we explore this issue.

In situations like these, you often have to know the author's work and their definition of terminology. A wider context is often needed. Remember that 'corpus' In this sense probably refers to 'a collection of spoken and written language used in the study of language and in writing dictionaries. ' Cambridge Dictionary

- informed is a combination word. it refers to giving you a direction, telling you something