Thanks for the heads up, got XRVSO.com too!
Of course, it isn't known, after all, it's a new term in digital marketing (my specialty), many marketers currently referring to it as voice search SEO which is wrong since SEO in itself means Search Engine Optimization. The industry giant Neil Patel, who has brands like Amazon, eBay, Google, Salesforce, NBC, General Motors, Hewlett Packard, and Viacom among his clients refers to it as " Voice Search Optimization".