Sending academic update - what to include

My son needs to send in an update to a college that asks for information about curriculum changes. He has not changed his class schedule at all and his grades are still good. But, should he include something that caused a significant, but negative, change in his academic experience this year? The syllabus has changed significantly for all his classes. His IB and AP testing will be affected by it as well. He is an IB diploma candidate, and has that on his applications. It is not covid related. Or since his grades are not affected and he isn’t dropping or changing a class, should he just leave that information out?