This is complete speculation on theymos part and yours though. There is no real reason for us to think that posts contained his real name or address.
Well, the name of the topic says it all.
What if is a speculation and there will always be speculations about Satoshi's identity. There were and there are also many people claiming to be Satoshi. But actually, this was not the point of my comment, it was about theymos' quote 6 years back.
Of course, we don't know the reason why theymos said this and it looks like he was informed about it by third party
(it must have). I also doubt that Satoshi who planned everything here very well, would leave informations to track his identity. But on the other hand the topic must have been deleted for a not trivial reason - otherwise it would be still available like number 1, 2 and 4.
That doesn't sound like Satoshi at all and its much more likely that the posts contained test posts such as "test" or "hello world" to test the forum software.
Agreed, that leaving his personal address doesn't sound like Satoshi but why topic number 3 was deleted? And theymos leaving this comment in 2012? Topic number 3 must have been an interesting one.
It was far more probable that the first posts of the forum were of low content and for testing purposes.
Then, the other topics would have deen deleted as well.
The current first post (number 4) makes sense as a introductory to the forum because current members will always be interested in the first post of the forum. Just look at the merit received by the first post and you will see that people do check these things.
It's topic number 5:
https://bitcointalk.org/index.php?topic=5