The short answer to your question is "yes," an honorably retired LEO must still obtain a CCW license.
Here is the "long answer" based on both statutory and case law information:
Sections 26150, 26155 and 26170 of the Penal Code would provide the answer. 26150 and 26155 provide the requirements or conditions an individual must meet before being issued a license to carry a concealed weapon.
Section 26170 indirectly answers the question of law enforcement, however.
"Upon proof of all of the following, the sheriff of a county, or the chief or other head of a municipal police department of any city or city and county, may issue to an applicant a license to carry concealed a pistol, revolver, or other firearm capable of being concealed upon the person: (1) The applicant is of good moral character. (2) Good cause exists for issuance of the license. (3) The applicant has been deputized or appointed as a peace officer pursuant to subdivision (a) or (b) of Section 830.6 by that sheriff or that chief of police or other head of a municipal police department. (b) Direct or indirect fees for the issuance of a license pursuant to this section may be waived. (c) The fact that an applicant for a license to carry a pistol,revolver, or other firearm capable of being concealed upon the person has been deputized or appointed as a peace officer pursuant to subdivision (a) or (b) of Section 830.6 shall be considered only for the purpose of issuing a license pursuant to this section, and shall not be considered for the purpose of issuing a license pursuant to Section 26150 or 26155.
Paragraph (a) and (c) applies to both active and retired law enforcement officers. Additionally, paragraph (a) and (c) carries the inference that because the sheriff can take the fact of the officer being (had been) deputized into consideration in their decision making process.
The implication here is that, because the sheriff can take that into consideration, the sheriff must still make a decision regarding the CCW application (further implying that the retired LEO MUST still apply for a ccw).
So, ultimately, the answer to your question would be "yes."