Yeah that's where the concept of the blink tag originates, the now deprecated HTML tag. But what's covered in the blog post refers specifically to a hidden (and AFAIK undocumented) blink tag that exists in the Android XML layout view system, which is an independent thing from the system WebView browser (that I assume probably still contains some code for blink tags, but that wouldn't be a surprising discovery). I don't know if there are any other built-in tags in Android views that really map to HTML tags otherwise.

This blink is in a specific UI XML dialect, not HTML.

It actually seems like there’s another Easter egg if you google “blink tag”: https://www.google.com/search?q=blink+tag

(Doesn’t seem to trigger on iOS, but works in Chrome and Firefox on desktop)