Undefined Reference Operator

I’m trying to setup environment with autocomplete in PyCharm to make a plugin, getting this error Undefined Reference Operator in PyCharm after following the article that says on how to setup everything.

My info from system-info.txt:

Blender:
=====================================
version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab44, type: Release
build date: 2021-02-25, 09:31:14

Python:
=====================================
version: 3.7.7 (default, Jun 13 2020, 11:11:23) [MSC v.1916 64 bit (AMD64)]

I have the exact same interpreter selected in PyCharm as Blender uses, I have copied all files from the 2.92 directory from this repository to blender directory.

And I have this directory in include path list for the respective 3.7.7 python interpreter:

The autocomplete works.

But I’m still getting the error for the Operator symbol. The addon works in Blender when I install the .py file. as an addon.

Not sure what is it. How were these files for autocomplete made? Can I add this missing Operator symbol myself?

Oh well, I git cloned the repository instead of downloading the release.

I just pasted files from 2.92 directory from the release version and Undefined Reference Operator error is gone.