Hello and welcome to the forum.
There are soooo many different chargers on the market, that it’s hard to come by someone having experience with a certain device.
The information, that can be obtained online is pretty scarce.
I didn’t find a manual. The ISY homepage doesn’t even list this device, but links to online shops only.
The description on one page states, that the charging current of 5V/2.4 A is divided between the two USB ports.
So, for faster charging, you should use one port at a time only.
Plugging something into the second port at the same time takes away current from the first port.
And the technical data doesn’t mention Quick-charge compliance at all.
And the list of compatible devices from the Qualcomm page (updated 02/2021) does list ICY IWC 3500 only as compliant with Quick Charge 2.0.
So, I would guess, that the IWC 5000 won’t be compatible with Quick Charge 3.0.
You could check out that list for compatible devices.
Btw. Fairphone isn’t listed as well.