There is no evidence either way, so let's not speculate. Clearly when people talk about Windows builds being available for launch they are talking about compiled, since most Windows users, unlike Linux users, don't have compilers or know how to use them.

The only one I recall who explicitly reported compiling it said that it didn't work, prompting Evan to make an emergency update (I'm not referring to the guy with the compile error due to his own mistake; the other one). This too was after the launch.