The only sources the article cites (aside from the various links to other articles on the same site) are two Psychology Today articles:

https://www.psychologytoday.com/us/blog/the-discomfort-zone/202407/interdependence-the-key-to-healthy-relationships https://www.psychologytoday.com/us/blog/the-therapeutic-relationship/202309/balancing-attachment-and-autonomy

Neither of these are making the claim that "learning independence too early" has a causal relationship with not maintaining close friends (might be true, but it's not being substantiated). Kind of makes me suspect it's an AI generated article, since it consists of plausible-sounding content that is seemingly spun up out of nothing. The site seems to be publishing 20+ similar articles every day.