"This is the average, remember, it is not the median. The average skews too high because of the long tail. There are a few who make several millions, who distort the average number, so it is not true that half of iPhone App Developers earn more, and half less, than $3,050 per year."
He references the long tail you mention, and describe exactly what you mean about some people making a lot, but because of distribution and how users find and download apps - its more akin to say - the lottery - than actual market strategy.
Some will make money. Most of them will be development/contractor shops that charge out-the-ass for mobile apps to companies who want a "mobile presence." These medium to large companies won't realize that the money they are losing isn't worth it until its happened a couple of times. Then they'll stop coming back.
That said, independent developers making money on that app store directly is a complete crap-shoot. Very few get rich, lucky ones make a very modest living, more get a hobbyist return, most get dick - and some don't even get the money they did earn from Apple.
Therefore all of your rebuttal and final conclusion are wrong. How many books have you written on the subject?
Note: The reason he uses a normal distribution is because it would actually help DISPROVE his thesis, a normal distribution would make it easier for an app developer to make money, not harder. When the normal distribution showed a shitty return - he reminded us it was actually worse.