In short, yes
mitram2
The male loneliness epidemic isn't only about the lack of romantic relationships.
It's about a generalized lack of connection between men and other people, a lack of community where they can find support when times get tough and where they can find meaning by helping others.
I'm not too savy on the social context in the far west, but I'd wager that although there was a lack of women the relationships between men would be very strong. Since the environment is hostile to human presence (lack of water, infrastructure, no large settlement or very far apart at least in the beginning) men would need to rely on others for help very often.
He did not say it's the only system where it happens
It seems he was just saying that in the current socio-economic model for most of the planet the elite of that system (the "capitalists") push for that behaviour, not that it wouldn't happen under any other
If I say I get wet when it's raining outside, I'm not implying I can't get wet during a sunny day (I might just have bad luck and someone dumps water out of a window)
No one said it's unique to that particular system. As I said feudalism would do the same for different reasons
But that doesn't mean it's impossible to have a system that disincentivises harming others and even if it's implemented it doesn't mean no one will be harmed.
Socio-economic models have to do with pretty much everything that happens in a society. They define the preferred end goal of most actions. In feudalism it would be to better expand and defend the territory of your liege, for example.
Makes a lot of sense. If I (an urban dweller) moved to the middle of nowhere and have to help build up all infrastructure while attempting to (barely) survive, I'd be pretty depressed.