Hi Red Steel! Did you somehow fail to notice the document you are citing from was amended in 1999?
You are looking at a modern, amended form of the constitution, and falsely suggesting that it is the original constitution of 1963.
If you look at Kenya’s original constitution, it does not call Kenya a Republic. This is hardly surprising, Kenya was not a republic until 1964. Documents before 1964, such as the original 1963 constitution, would not be expected to call kenya a republic. Documents after, such as the 1999 you cite, would call it a republic.
You can review the original 1963 constitution here.
http://www.constitutionnet.org/files/KEL63-002.pdf
Read post 473.
Very good, but are you sure it answers the question?