Very valid points. What happens if you doubt is that you will be called jealous, that you say it is impossible because you can't do it and such things. Just read this guy's facebook page and you'll see that happening over there. People want to believe.
That makes sense, but one would have expected his earlier claims to generate scrutiny once they started getting written up, or even sometime during his first 20 days of running miles at Maserati pace on this expedition to raise an eyebrow. And, yet, it took a (at the time, apparently entirely credulous) LRC forum member to go for a 1:00 a.m. jog in the middle of nowhere to blow this apart. Perhaps that's what Rob was depending on, but it strikes me as somewhat unsettling. Even if no one physically verified it in person, shouldn't someone, somewhere, have looked at his daily times as they were rolling in, generating tons of interest, before this and raised questions. I mean, in baseball, if a guy's OPS jumps up by 10%, you get 10,000 articles insinuating he must be using steroids, but here's a guy who gets written up for being maybe the best distance runner ever despite an apparently thin resume (so thin it was largely self-invented, per your reply), bizarre diet, etc etc. Again, I'm a purely recreational runner. I have no idea how people can run a 4 hour marathon, let alone sub-3, let alone ultra. But I am a natural skeptic and it seems like no one applied any skeptical thought here until Asher shot a video.
After you've seen a few you just say "Oh, there comes the next clown". Remember that usually you have no solid proof, because it was not under verified circumstances. You just know from experience that what is being claimed is impossible. Because you know what the best in the world are capable of. But without real evidence it is just "this is impossible" against "sure it is possible, I did it, you just envy me". Nothing is be gained from that.