How to delete python interpreters
Solution 1:
From my understanding, the Pycharm list of interpreters is only a list of available python interpreters. It also lists those that were created as virtual environments, as you noted.
You can safely remove those in the list without affecting your actual python installs. This is done by clicking on the gear to the right of the list and selecting the More... option
From the pop-up window, you can then delete any of the listed interpreters you want.
If you want to remove the homebrew versions of python you can use the following commands in terminal:
Python 2.x
brew remove python
Python 3.x
brew remove python3