In the first post, he explains (via a video) why he started the KillerPHP website and some of his thoughts on PHP - including his recommendation that every web designer/developer out there learn it.
In his second post, he tackles the other topic - why PHP books are difficult for people who aren't already programmers.
I've read 20+ books on PHP and have watched many videos. One thing that I found consistent about all of them was how they were not 'friendly' to non-nerd types. Why? Probably because (most of the time,) only hardcore code-monkeys seem to be writing these books.
To that effect, he's created his video series to help the non-developers of the world learn this great language in a simple, easy to follow fashion.