Maybe. But not always. The cable would be used at the pool professional’s discretion and is dependent on the type of installation.
In some cases, a cover can be directly installed into the wall with snap hooks into the eyelets (this is what we call a direct install). In that instance, no cable would be required. In other situations, an installer may choose to run a cable through the wall anchors.
Either the cable install or direct install are both accepted options.