Not telling your kid they have a learning disability, chronic illness, mental illness etc. so they can “feel normal” actually does the opposite. They will not feel normal if they do not have the context to understand that their normal will be different from that of their peers.
The amount of times I’ve heard a parent say something like “I’m just not going to tell my son he has ADHD, I want him to feel normal.” HE DOES NOT. HE DOES NOT FEEL NORMAL. HE IS WONDERING WHY HE IS STRUGGLING AND COMING TO THE CONCLUSION HE IS AN IRREDEEMABLE FAILURE.