I can now partly answer the question myself because I bought the unit. The two USB ports on the device (voltage 5Volt, 1x with 1Ampère, 1x with 2A) are not powerful enough to charge a notebook. The supplied connectors for the more powerful sockets (19V 3.5A, 12V 10A) are all round plugs, nothing for my Macbook.
The diversions would probably be: Buy an adapter with a cigarette lighter socket that can be plugged into the 12V 10A port (available in the Swaytronic accessories, not included in the set), and buy a cigarette lighter plug with a USB-C port (and one that has enough power, i.e. not the 'normal' ones that can only charge mobile phones and tablets).