How do I HIDE the DELETE item in the LIST ACTIONS dropdown?

Tried adding a custom ACL to disallow DELETE as per

https://enricosimonetti.com/powerful-customisations-with-sugars-acl/

but this does NOT seem to work when I try it on Sugar 13.0.3

custom\Extension\modules\Contacts\Ext\Vardefs\acl.php

$dictionary['Contacts']['acls']['SugarACLDenyDelete'] = true;

custom\data\acl\SugarACLDenyDelete.php

class SugarACLDenyDelete extends SugarACLStrategy {
	// allowed user ids
    protected $user_ids_to_allow = array(
    );

    // denied actions: example was READ-ONLY, we want to deny only DELETE
    protected $denied_actions = array(
        //'edit',
        'delete',
        //'massupdate',
        //'import',
    );

    // our custom method to check permissions
    protected function _canUserWrite($context)
    {
        // retrieve user from context
        $user = $this->getCurrentUser($context);

        // allow only admin users or special users access
        if(/*$user->isAdmin() || */in_array($user->id, $this->user_ids_to_allow)) { //we DENY to ADMINS too
            return true;
        } else {
            return false;
        }
    }

    // runtime access check
    public function checkAccess($module, $view, $context)
    {
        $view = SugarACLStrategy::fixUpActionName($view);
        // if it is not a blocked action, or there is no bean, allow it
        if(!in_array($view, $this->denied_actions) || !isset($context['bean'])) {
            return true;
        }

        // can user write?
        if($this->_canUserWrite($context)) return true;

        // everyone else for everything else is denied
        return false;
    }

    // mostly for front-end access checks (cached on the application, per user)
    public function getUserAccess($module, $access_list = array(), $context = array())
    {
        // retrieve original ACL
        $acl = parent::getUserAccess($module, $access_list, $context);

        // if user can't write
        if(!$this->_canUserWrite($context)) {
            // override access, disable access where required if not admin and not special user
            foreach($acl as $access => $value) {
                if(in_array($access, $this->denied_actions)) {
                    $acl[$access] = 0;
                }
            }
        }

        // return modified acl
        return $acl;
    }
}

Can anyone point me to a way that works in v13+?