So with my Samsung Galaxy S8, fast charging went without a hitch. I have also connected it to a wireless charging pad and it is also charging in fast charging mode. I can't say at what strength the current flows through the cable.
Reading through all the reviews here, I doubt it. -> https://www.digitec.ch/de/product/ratings/atra-3-in-1-magnetisches-usb-kabel-a-c-a-lightning-a-micro-1m-usb-kabel-6933249#rating
Yes, it is.
I've both cables/pin's and they are fully compatible in both ways. My feeling is that the cable integrated magnet is a bit stronger from this Atra cable than from the picked cable.