Much to the opposite, just like many other big and important open source projects, they are actively trying to recruit, mentor and urge people to come as far "in" as possible. It takes a lot of work and dedication to get acquainted with a code base.
The choice of the word "fraternity" by the poster above was deliberate and seems to be being used to imply a more severe exclusion of others.
However, I've just looked it up in Merriam Webster, and it looks like this term can include female members, too, even thought the word and the related adjective have strong masculine associations. Wikipedia basically says the same, "Although membership in fraternities was and mostly still is limited to men, ever since the development of orders of Catholic sisters and nuns in the Middle Ages and henceforth, this is not always the case. There are mixed male and female orders, as well as wholly female religious orders and societies, some of which are known as sororities in North America."
We don't even have to argue anyway. From a dictionary:
> [treated as singular or plural] a group of people sharing a common profession or interests: e.g. “members of the hunting fraternity”.
Frankly it’s very easy to google.
I'm struggling to find that in the quote. What is the fraternity in question?