In the same way that you would expect "AngularJS for Node Developers" to include information on running your app using a Node.js backend, this has information on using a .NET backend.
Presumably someone who works with a particular framework, whether that's Django, Ruby on Rails, or ASP.NET MVC, would like to know how to properly use AngularJS with those frameworks without throwing out the benefits those frameworks provide. I'm assuming you have enough web development experience to understand that not every backend is just a dumb REST endpoint.
if you think devs working on these framework don't understand client side javascript/HTML framework on its own and need to be explained for their particular framework, may be they outta be not writing code at all.
Also, another thing that bothers me about MS is that they hide so much real HTML/javascript from devs with visual basic like facade called webforms that MS devs don't get into a new platform unless they see a document like "Angular js for .net" title.
Webforms hasn't been Microsoft's first-class web development platform for a while. We are a .NET shop and most teams excusively use MVC for all our new web development, which exposes HTML/JS at a very unobstructed level.
Microsoft is moving even further in that direction with Web API, which does largely transform ASP.NET into a "dumb" REST endpoint completely separate from the HTML/JS clientside.