Always need a power adapter with this adapter?

In this video

I have the possibility that you can connect an external video card to a laptop. With the adapter. My question is: do you still need an external power supply on this adapter, or only with graphics cards that consume more than 75 watts? For example, a GTX 750 TI consumes only 75 watts. Do I also need a power supply on the adapter?

Yes, you need. Mini pci-e does not even have a 12 volt power supply.

And certainly not enough for 75 watts. 75 watts is very much for a laptop.