I agree that it's a sad state of affairs, and a self-fulfilling prophecy. Maybe I can explain my perspective in a little more detail.
In my typical day at work (teacher), I spend hours talking with dozens of people. A large part of why I chose this work was to escape the isolation that I felt previously when I was doing remote software work. I attend weekly religious services and make an effort to stay for the social hour afterwards. When I go to parties, I don't feel like I have an unusually hard time talking with people. I'm not always as engaged with the world as I'd like, but I don't feel that I'm avoiding it either.
But this article isn't broadly about having conversations with new people: it's about approaching strangers in public settings one-on-one (the article mentions a bus stop, the street, and a mostly empty train carriage), where there's no expectation of social interaction. This is a different situation with its own set of pitfalls. Nobody is going to assume that I'm trying to rob them when I introduce myself at Quaker meeting. No one is going to think I'm a creep for asking a student about their hobbies while I'm at school. We don't see articles about people getting shot for starting up a conversation at a party.
But all of that goes out the window in the settings that the author describes. It's funny, the author mentions feeling like it was "rude and unsafe" to start a chat during the pandemic. I felt like talking to strangers in public got much easier during the pandemic, when people were desperate for any sort of in-person conversation. It's the normal times when this sort of interaction feels rude and unsafe.
Maybe I'm too pessimistic, maybe it would be fine for me to let my guard down a little. I think that loneliness is a huge issue these days and I'm grateful for the efforts people are making (including the author of the article) to address it. But approaching strangers in public in the way the author describes is a special case that is *much* more fraught than other types of social interaction, and is a lot harder for certain people to do successfully. I wish it weren't that way, and maybe it's worth pushing back against, but that doesn't change the current reality. Some people might not feel this way, but they're probably the people for whom it's not true.