Why the “and”?

I guess they both did community management, and management ?

But e.g. Project Leaders (in special.json) is also management, right?

Why the “and”?

The obvious answer is because I didn't change it.

So if you want to know the answer why it's there, you can find the string was introduced in rP17830.

That commit just moved the content of the forums thread to the codebase:
https://wildfiregames.com/forum/index.php?/topic/15542-did-you-contribute-to-0-ad-make-sure-you-get-in-the-credits/
There was a "Community and Management" as well, since January 13, 2012.
The one who wants to change that can propose that separately.

But e.g. Project Leaders (in special.json) is also management, right?

One might consider dividing project administration from community management (e.g. online service administration),
since the former are supposed to be the top of the hierarchy in project development and the latter subordinate, or whatever.

Thank you for the elaborate answer!
I was just wondering whether “Community and Management” isn't actually just “Community Management”, since there's just one list.