I like that introduction. I read it when I first came to the forum.
I think they're decent enough. What they do is explain the correlations (or lack thereof) socionists saw between two different types, and the socionics type different people with Myers-Briggs types identified most with. What they do not do is show that if you are XXXX then you are XXXx. Such an idea is foolish, and is only applied by people like Phaedrus, who don't really understand systems like socionics because they're so obsessed with correct logic.