Your laptop definitely does not use Qualcomm's QC3. It uses USB-PD. So either your phone isn't quick charging, or you have some magical Shrodinger's cable that is both compliant and not compliant with the USB-PD standards.
For the record, a USB Type C connector !=
USB-C is simply a connector. Unless there's some magic cable that I'm oblivious to (and I don't claim to be the gods' gift to USB cables), an Anker cable that is QC 3.0 compliant will not fast charge a USB-PD device like a laptop, iPhone, Pixel, Essential, etc. In fact, the cable could potentially fry a device.
- USB 3/3.1
- USB PD
- Quick Charge
- Dash Charge
- Thunderbolt
- ???
- Profit
...and that actually reminds me of something. Conflicting reports say that the S9 supports PD. I can't wait to see the salt flying when all the fanbois find out their QC3 setups don't work any more.
QC3.0 is not mutually exclusive of USB-PD for cabling. Assuming he has a USB-C/PD charger, and using a USB-C to USB-C cable, he could be using it to USB-PD his laptop, and also charge his phone. Also keep in mind, USB-PD is NOT required to fast charge devices like phones. Yes there are a few phones that are specced up to USB-PD, but that's REALLY fast charging.
Also, not at all a fact that a USB-C compliant cable could fry a device.