I don't know where you are getting this information but it is not true. They do not need 1 acre per bird to free range. To clip wings or not depends on a lot of things. You need to define what you mean by a confined space in order to give credence to what you said.
Don't give keets hot water. Lukewarm water is fine, hot is not.
Read the Raising Guinea Fowl 101 thread. Pay particular attention to any posts made by @PeepsCA who is the most knowledgeable guinea person there is.
https://www.backyardchickens.com/t/312682/raising-guinea-fowl-101