I think people often memetically comment that because they've found they like it or found it to be a cheap way they can buy into hypothetically socializing. I like coffee shops and would happily meet there with a friend, but for someone with a scarcity of organic interests that would naturally take them there, they need to explore why that is and why it seems troublesome first. You can't or shouldn't try to just hack your way into a good social life by adopting arbitrary social activities; though many of them might be fun to explore among a long list of potential other things to explore.
Many people move to cities from the suburbs of their hometown where everyone they knew just happened because they were already around them for the specific reason that they had to be around them day in and day out, like an office job in a way.
My biggest recommendations would be to explore the area and be open to trying new things, and then also to meet your coworkers and their friends eventually, if you can.
So many people I know back home have only ever made "friends" with their coworkers, and if that job went away, so would their "friends", because they are linked in only that way. If you meet your coworkers friends somehow though, the only reason that relationship would flourish to the point of friendship is that you each felt that it should, because you discovered common ground or realized you both had chemistry.
Likewise, another thing I recommend to people who feel isolated, is to try and find something you like doing for 2-3 hours a day, once or twice a week, somewhat around other people. Could be the gym, could be hanging at a coffee shop, could be many other things, you just need some common faces regularly so you have the opportunity to discover if you vibe with them. It's important that you'd do it regardless of anyone else being there too. You need to be down for it, and anything else that happens should be considered a lucky side-effect.
So yes, it's not that simple, and you're absolutely right.