Do you have data for this? This contradicts common sense and every datapoint I’ve seen so far that isolation is a rapidly rising issue.
Face validity. Someone may have pulled together numbers for this in a study, but this area is a new facet of interpersonal behavior at a macro-economic level, so there won't be much published on the subject yet.
Here are some good high quality surveys:
https://pmc.ncbi.nlm.nih.gov/articles/PMC5547349/
https://ourworldindata.org/lonely-not-alone
But frankly I wasn't kidding when I said every quality survey shows this.
If you have ever seen an article suggesting that loneliness is higher in the West or in capitalist economies or whatever, you have been 100% misled. That is essentially just a made up narrative that plays well in articles