But.. that can be said about any java (jar) programs class files. It is also not difficult to decipher the asm of a disassembled exe file, but to equate that with finding the source code of the program would be disingenuous.
Decompilation of executable C files is much less accurate and usable than decompilation of Java class files, which usually produce verbatim Java source code. I don't know if source was or wasn't directly disclosed here, but if they leaked vanilla Java class files, that's basically equivalent to their source code.
You can drag drop that jar file into http://jd.benow.ca/ and in two clicks you have 100% of the source code, variable names and all. It's not the same as decompiling an C executable by any means.