Sriracha is originally a Thai sauce (IIRC), though it's popular in neighboring countries.

Huy Fong brand sriracha is based, and originally popular, in California. It has a distinctive flavor; every other competitor I've tried has been too vinegary or too sweet (your tastes may vary, of course). So I can absolutely believe the stories in the article.

I haven't tried Underwood yet. It's made by their original pepper supplier (Huy Fong switched in 2016), but I hear it's a bit different.