That is the correct link. You'll find the information 1/2 way down the page, under; Cowl Hood (ZL2)...Here is what is written;
Cowl hood (ZL2): The cowl hood was an option on SS and Z28 models in 1969 and was included on all COPO's and Pace Cars. It was introduced midyear 69. #1 ZL1, built 12E at Norwood is one of the first Camaros to have a factory ZL2 hood. A late December LOS-built Z28 with ZL2 has also been documented.
The ZL2 option included a solenoid and flapper in the hood. The wiring for the solenoid was routed through a special hole in firewall above the fuseblock. Only 10,026 cars received cowl hoods in 69 and about half of those went to COPO's and Pace Cars, meaning there were only 5,000 Z28's and SS's (out of about 20,000 Z28's and 30,000 non-Pacer SS's) that received the cowl hood.