The message that appeared was apparently the advertisement shared by the forum admin.
Factoids are not advertisement but they are educational sentences from forum admin.
Regarding Bitcoin is still a beta software, I can't answer because I don't know about Bitcoin in detail.
It is what factoid roles is for, educational purpose.
Wayback machine has an oldest snapshot on 8 May 2013 and the sentence was there. It means the specific factoid sentence has never been updated since 2013.
https://web.archive.org/web/20130508064500/https://bitcointalk.org/adrotate.php?adinfo