This is incredibly misleading, and not because of the author for once.
Samsung apparently has a “DeX for PC” app which essentially mirrors the phone screen to the PC. DeX, the desktop mode for when you cast or plug your phone into a display, is not going away. DeX for PC has been replaced with the same functionality in Link to PC (previously phone link), and Samsung is choosing not to continue making a competing product with their partner (where I believe Samsung is still the only one that supports screen mirroring in Link to PC anyway)
I use Dex for Windows everyday at work. Keeps my personal accounts off my work PC.
But I thought DeX was the “use your phone like a PC” external peripheral support, which is staying, and link to Windows was always just another thing? Are they just removing duplicated functionality?