This is 100% true. The contents of the annotations are summaries of cases written by someone other than the court (sometimes the court's staff but most often by an indexing service like Lexis), and aren't actually law. Their sole purpose is to identify to attorneys and judges which cases stand for which principles. They are never even a complete statement of the law of that case, since they are usually a short paragraph long and only mention one of many issues the court dealt with. Half the time, the case identified by an annotation isn't even useful to the project, but they are always a good starting point.