Sad to say I can't find it. But it had interviews of top sellers of t-shirts. These people would literally type random English letters into online search engines (obviously not Google) and see what got auto-suggested. Then they'd choose the auto-suggestions that literally looked the prettiest or coolest to them. Maybe change a letter here or there to make it look even more cool. Then off to the t-shirt printers.

Don't know about the GP's article, but there are actually quite some YT videos around of someone interviewing people in Asia (I think the last one I saw was based in Japan), asking them if they know the meaning of the words on their shirts.

Some of these are hilarious..

While living away from my native California, I had a good laugh seeing someone with a "San Bernardino Beach" shirt.

I have multiple shirts that say Surf Ohio on them, I’d assume it was also a tongue in cheek thing like that.

Well in my country (3rd world country), most t-shirts are imported from China. If they have slogans, it's with English text with broken grammar or usually with text that doesn't even make sense. No one bothers though since English isn't widely spoken in neither of the countries.