Have been using pyenv, but not pyenv-virtualenv. And don't use an IDE.
Although the article was written many years ago, would suggest separate sections for installing and using: pyenv and pyenv-virtualenv.
RStudio/reticulate needs environment variables. Vanilla pyenv does not.
Would be nice to have something to compare against (article sections): pyenv vs pyenv+pyenv-virtualenv vs pyenv+reticulate