You are right. Funny that Casey Parker cannot point that out by himself
(herself?).
However I do not believe Casey Parker's post has anything to do with "a
misunderstanding of the insecurity of Java applets, as being insecurity of
Java".
My understanding of that message now is that "your data" actually mean "the
OpenJDK 7 framework", "another source" actually means "Trisquel's repository"
(since the package "openjdk-7-jre-headless" package is in it) and the
subsequent insult was not only against the community guidelines but also
completely gratuitous (because, obviously, "Trisquel's repository" is not
"another source").