The "x" versions are pre-release stuff. It can, and does, change rapidly. Sometimes it contains nasty bugs. The "x" releases are deliberately not made visible on the download dropdown - you have to know to fetch it with curl or pt3upd.sh and hope that I didn't just build something with a bug in it.
I make no attempt to version the "x" stuff -- there have been hundreds of pt3.3sx builds -- if you have one it is probably not the same as anyone else's 😉
Certain people have been urging me to get better about the versioning process.
(Somewhat off-topic): That KB list is pretty close to a list of my own that I've been updating off and on over the years. I stopped updating mine when, thankfully, I got rid of my last WG license.
However to me this looks questionable, re licensing requirements for TDE:
OpenEdge Enterprise RDBMS and OpenEdge TDE or alternatively Advanced Enterprise Edition RDBMS available since OpenEdge 11.5 (for Production)
OpenEdge Development Server (for Application deployment)
I don't see what OE Dev Server has to do with TDE. It is the development version of App Server, is it not? Same goes for the footnotes for MT and TP.