I would not advise it. If he wants to share that information with his friends that's his choice. However, I would not allow my DD to do a presentation on her allergy. It would make her a target because her medical condition would be disclosed. Trust me it gets disclosed as it is and that certainly opened her up to bullying in first grade.
IMHO, that's really bad advice on FAAN's part. I honestly don't know of any other organization representing medical conditions that advices having children do a presentation to their classmates on their medical condition.