crypto-exchange | iOS cryptocurrency exchange-rate app | iOS library

I'm currently developing an app in which the user can save news articles to a database in local storage. This is how I'm executing that transaction.

I'm somewhat new to Swift and to development tools in general. After researching a lot about a question I had, I finally decided to ask it here. I hope it makes sense and be useful to others like me.

I wanted to take a look at a project in github: https://github.com/jyoo980/crypto-exchange

I clicked "Clone or download" and then "Open in Xcode". After that is done, I quit Xcode and I navigate to the project folder in the terminal and do a "pod install", which runs without any errors or anything. I go back to Xcode and I see files missing from the workspace marked with red. And of course the build fails because of "Build input files cannot be found". Missing files in workspace Build input files missing

What I noticed is, in Finder, the files are actually in the project but they are in subfolders, instead of the Model group as follows: Finder project files

So my question is, why would the project be structured like this in Xcode? And why would it not work right away when I clone it from github? Could this be a CocoaPods problem? Of course I can go to the "red" files and specify their location in Xcode and when I point them the problem is gone, but I would like to understand what's going on here.

Thanks in advance!