But I totally agree with you. Not only is it not possible to scroll without the two-fingers trick (which I didn't know about until now, despite being a pretty advanced/heavy iOS user), it also scrolls really jumpily.
But the hypocrisy shouldn't detract from the merit of the article: his points are well-made and correct. Although the article suggests the methods are the problems and that they should change them (e.g. the removal of the carousel and introduction of greyscale thumbnails), but actually these aren't necessary: some iOS developers have taken it upon themselves to improve the daily, and have come up with the following: Loren Brichter (Tweetie/Twitter) optimised the carousel [1] and Jonah Grant optimised page turning [2].
As an aside, is it really so unusual to see an iOS (or any mobile platform developer) ignorant of their platform's corner-cases when it comes to things like mail or the web? We spend all our time on laptops coding, just like everyone else ;-)