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
Even the surveys you sent already suggest that people who live with spouses are much less lonely, which seems to be the opposite of your claim.
Frankly, your claim sounds so insane to me (someone who has a lot of choice in how I spend my time, enjoys the company of others often, and is not lonely) that I think it would require extraordinary evidence to convince me.