Conjecture is not actually confirmed.

[fieryprophet]

This part here is quite comforting, because a conjecture many of us probably have is confirmed.

There's a false assumption in this statement, in that usage of swear words is somehow indicative of the quality of the language or professionalism of its users.

1. Programmers tend to swear more in public spaces than the general population, particularly in environments where discussion of real world problems and code are prevalent. See the Linux mailing list for a prominent example.
2. /r/php is heavily weighted towards discussions of real world usage and troubleshooting despite the constant reminders that it is not a support subreddit, as well as discussions regarding future directions of the language itself and an innumerable number of frameworks and design patterns that are constantly being compared.
3. The conjecture linked to is itself extensively flawed, where the author misunderstands a number of implementation details, constantly sets up straw men arguments, and overlooks or downplays a number of language strengths in favor of a clearly biased viewpoint misconstrued as being fair-minded.

[Dobiasd]

Yes, you are totally right. But this article is meant to be fun, not hard science. And since this one seems to be the main joke, I guess I will leave it in. ;)
But I added a remark that correlation does not imply causality. I hope it now is OK.