Well, they want to power the PSVR PC adapter, which they said themselves requires rather 5V 3A:
Their idea, as I read it, is to have a way to power the PSVR PC adapter from the laptop, i.e. to not require an external power brick, but rather have a solution which just plugs into the laptop fully. Or at least that’s what I would do. So this is where we stop being able to rely on any USB Power Delivery, as the laptop can output only 5 volts, no power delivery negotiation possible.
And my point with proposing a USB-C cord was that they mentioned not wanting to solder tiny USB-C headers.
The cord makes the soldering work much less involved.
and also that power delivery through a USB-A expansion card is limited by the card, so it might not output enough power:
thusly starting with USB-C for that project is much preferred.