Almost every "fact" in this article is pure unresearched nonsense.
In no particular order.
OS X Server doesn't need an Xserve - it runs on many of my customers Mac minis just fine.
The price is not what Apple have always charged - it is half the price, or the same as the old 10-user license. It now comes only in "unlimited".
Snow Leopard is just what was promised: a streamlined version of Leopard; slimmer, faster, few new features. Even so you've glossed over far too many of the new features, including Grand Central and the mobile push support.
10.4 was "Tiger"; "Panther" was 10.3
Leopard already supports 64bit and greater than 4GB memory. Snow Leopard just makes even more of the basic software 64bit. There is (and always has been) only one version of OS X that runs all 32bit and all 64bit apps side by side
If you still have a PPC Xserve it's been out of warranty a long time and you really should be upgrading to something that it is easier to obtain parts for.