This is a Power-Z from Chargerlab - a current meter or power meter and no, it will not be part of the article or scope of delivery.

This is not part of the product. It looks like an adapter that measures the power supply like the powerbank.
But it's a separate product.

All you get with the battery is a storage/carrying case and a USB-C to C charging cable.

If it's a Mac, the intermediate plug could be a kind of powerguard, from USB C to Lightning.