Entities/Permissions/Model/Permission.php
public function isDeletable(): bool
    {
        if (in_array($this->title, self::UNDELETABLE)) {
            return false;
        }
        return (PermissionsTableMapper::getInstance())->isDeletable();
    }
public function isDeletable(): bool
    {
        if (in_array($this->title, self::UNDELETABLE)) {
            return false;
        }
        return (PermissionsTableMapper::getInstance())->isDeletable();
    }
whether this model is allowed to be deleted