Avherald's a weird site. First off, because DavidReidUK is the Anti-Avherald: mention the site, and he's guaranteed to make an appearance, taking every opportunity to mock it.
Second, yes, it's just one guy, and he has some rather odd standards of journalism. For example, he doesn't report "unofficial" sources: as near as I can tell, he uses recordings from LiveATC and ADS-B sites, but he doesn't always credit them. In fact, he sometimes even claims it's his policy not to credit them.
Third, his coverage is spotty. Of course it is. He's aggregating a number of official and unofficial sources, and he won't tell you what they are. Every day, there are a variety of events -- IFSDs, In-flight emergencies, even evacuations -- that don't make it to his pages. We all know this.
Yet, if you want somewhere on the internet that brings together concrete (and not-so-concrete) information on aviation events, what else are you going to do? Read through 175 pages of some thread on PPrune, where the same facts are repeated every five pages in between moral indignation, idiotic speculation, and wild-ass pontification?
It's no wonder that Avherald has been the point-of-origin for a variety of aviation-oriented stories that hit the news.
This is also what's rather disappointing about Simon's weighing in on this issue after meeting with the parents. Reading his account, each piece of evidence in favor of the "suicide theory" might be suspect for a different reason. If you chain these improbabilities together, then it might be the case that something other than a suicide happened, provided there was an autopilot failure, door lock failure, FDR failure, and the poor FO suddenly passed out while maintaining a regular breathing pattern through the mouth. Oh, and someone falsified the record of his depression. That's considerably more improbable than case made.
The BEA, however, is interested in Probable Cause, not the preponderance of evidence or certitude beyond reasonable doubt.