This is the first post on bitcointalk.org
Welcome to the new Bitcoin forum!
The first post in bitcointalk is satoshi testing the forum -- not this official welcome message. You know just quick facts

Topic 3 was deleted years ago, and it is unknown what happened to it. Topics 1 and 2 were satoshi doing some tests, and topic 4 was some administrative notes left by satoshi.
See below for PDFs of the first topics:
topic 1topic 2topic 4As an FYI, there are links to the above topics in the link you referenced.