Hi,
In the previous version of the softweare used to run these boards you had to be Level 4 to access the Lounge (it was still 8000 points)
All the way through the iChat 4 period I used to tell the Hosts that the page was out of date regarding both trhe Version number and the OS version drop down.
The OS version drop down was solved by the page being added to a list of pages that should be updated at OS Updates and Upgrades (so it does list OS X 10.9)
You will also notice that the Camera text fields also presume Firewire or similar camera (external iSight and similar) and not any Internal USB iSight or FaceTime camera or any external USB 2 (UVC Compliant camera).
The actual Version drop down is wrong from the start

The Public Beta like the Messages beta was available during the Previous OS.
It was akin to version 2 (IChat AV is version 2)
In Jaguar it was a Paid for add on app you could buy.
In Panther it was free.
Then comes the 2.1 update and is not a beta.
After that the Version 3.0.1 is the only standalone Update there has been since.
All updates since then have come in the OS X updates and therefore the version and the OS need to be "Matched"
Version 3.x.x also gets to version 3.1.9 by the time the OS has got to OS X 10.4.11
There is also a Number change to the 4.0.8 version after a security update at the time which in some views lists it as version 4.0.9
As I have stated, the page has never been that good about these things anyway so I don't actually read that much into the fact it does not list Messages.

8:44 pm Thursday; December 5, 2013
iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad