You're correct. What I love about the Sequences in general is that it's a colloquial, patient introduction to lots of new concepts. In theory, even somebody with no background in decision theories or quantum mechanics can actually learn these concepts from the Sequences. The Simple Truth is significantly different in tone and style from the majority of Sequence posts and the concepts which that post satirizes are not really introduced before the comedy begins.

If you go to http://wiki.lesswrong.com/wiki/Sequences and choose the first option (1 Core Sequences), then choose the first listed subsequence (Map and Territory), the very first post is The Simple Truth. The second choice is What Do We Mean by Rationality? which really, really seems like it should be the first thing a newcomer reads.