alt Hacker NewsHere's the problem with online relationships, you can pick them up and drop them whenever you like. You can do that in real life to a degree, but sometimes you are forced to confront friends in real life when you don't want to. A real friend requires surviving a degree of confrontation.
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This is the crucial difference. The online abstraction facilitates behaviors that are destructive to friendship, like ghosting, blocking, or even banning if you have admin powers in their meeting place.
Also, since real life is abstracted online, small issues tend to become dramatic because. It takes courage, and some recklessness, to open yourself to a total stranger that might not even be what they claim to be. For us who saw the initial anonymous wild west of the Web, it's difficult to trust people online. It might be different with younger generations that grew up with having their real identity open in several mainstream places.
The OP article talks about people met online who they subsequently met and hung out with in person. To me, this is now an meatspace friendship, so yeah, it's "real".
Pure online relationships where you have never met or seen the other person are in my experience an order of magnitude less "real". As you note, there's no 'skin in the game' and ghosting a relationship is zero effort and likely zero consequences, and when everyone knows this is the case the relationships are equally less consequential.