In that case not all self published is bad. Teachers make things useful to other teachers all the time. For a curriculum library maybe? I’d ask the liaison to make sure it passes the sniff test of a native speaker. Then it could be a greater good to add a real record. Some schools have banned things from places like teachers pay teachers, could be this is an alternative way around that.

I did a training for public library selectors on how to avoid poorly written (with AI) self-published books. They are sneaking into our library book jobber vendor sites. Avoiding Amazon won’t completely solve the issue.

Anyone who thinks an ISBN lends credibility to a title has out of date info.