Adopted in 1963, Amended in 1999
Article 1
Kenya is a sovereign Republic.
Article 1A
The Republic of Kenya shall be a multiparty democratic state.
Article 2
The Public Seal of Kenya shall be such device as may be prescribed by or under an Act of Parliament.
Article 2A
(Repeated by 12 of 1991, s. 2).
Article 3
This Constitution is the Constitution of the Republic of Kenya and shall have the force of law throughout Kenya and, subject to section 47, if any other law is inconsistent with this Constitution, this Constitution shall prevail and the other law shall, to the extent of the inconsistency, be void.
CHAPTER II- THE EXECUTIVE
Article 4. The office of President
There shall be a President of Kenya, who shall be the Head of State and Commander-in-Chief of the armed forces of the Republic.
Article 5. Election of President
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