Unfortunately, since Medium's latest update, the Enhanced Stats update doesn't seem to be compatible/working anymore (this is an older article). I don't know if the coder is planning to update it to work again. However, a different Chrome extension, Mediums Earnings Info, is still working and has almost the same fuctionality: https://chrome.google.com/webstore/detail/medium-earnings-info/eaalkfagdfokodepkfpcckcfballnedm