Nah, it was not merely depression. Full quote: "men of town have drowned themselves in video games, porn and drinking/drugs". Which is way more then being depressed. It does not matter whose is to be blamed, but dating anyone like that is receipt for unavailable alcoholic partner. And she won't meet him anyway, cause he is moving solely among males.
His explanation is "because they've no meaningful relationships", but then he proceed to define meaningfull relationships as romantic only.
No girl can fix any of that. They can't fix lack of friendship, can't fix lack of familly relationships, can't fix no roots in local community. Women are not rewards for good behavior nor cure for mental health problems. If you expect any of that, you will end up ressentful of partner who won't be able to provide that much.
Having long term partner is not cure all, nor cure for depression or loneliness. Not in long term, not after initial honeymoon passionate period ends.
I doubt that majority of town girls have foreign long distance intercultural partners. Such relationships are quote hard to keep and generally rare. Despite there being some girls with foreign boyfriend, majority will date local or not at all.
And plenty of girls have depressions on their own, mental health problems, bad habits, possibly own addiction struggles. Problems in families with relatives or on the job.