Block/Cache/Additional.php
public function canShowBlock()
    {
        if ($this->config->getType() == Config::FASTLY && $this->config->isEnabled()) {
            return true;
        }
        return false;
    }
public function canShowBlock()
    {
        if ($this->config->getType() == Config::FASTLY && $this->config->isEnabled()) {
            return true;
        }
        return false;
    }
Check if block can be displayed

@return bool