Stadia launched with 3 indie games, one of them exclusive. In just the last week they added 3 more indie-ish games (Spitlings and 2 titles from SteamWorld). They also announced at least 4 more indie-ish titles to land soon (Lost Words, 2 more SteamWorld titles, and Stacks On Stacks). So how can one claim that indie developers are not porting games to Stadia? At least some clearly do.
Speaking of Business Insider - in my personal opinion, they are a click factory. They'll write anything that drives clicks, just look at their landing page. "Stadia is DoA" drives clicks and Business Insider wrote quite a few articles to that extent. They know how to run business.
Speaking of this specific article: if devs and 'executives' believe Google is not serious about Stadia, why no-one agreed to speak on record? Is it possible that that these contacts actually think there is a path forward for Stadia and they don't want to burn bridges? Or maybe these industry contacts are imaginary?
Disclaimer: happy Stadia user, playing indie games on it and confused when someone says that indies are not porting games to Stadia.