I had been asking myself this since I started following IndieHackers a couple of months ago. And now this article has brought up that issue more intensely. Point is, how can we really trust any article from the website if no minimal check is happening on the interviews ?

I recommend treating the interviews like you would treat a tweet or a comment on Hacker News, just more detailed. If you plan on making a critical life decision based on the veracity of a specific claim, do some research first, and perhaps contact the interviewee.