You can go to the Reader mode on Safari and export as PDF, then email the PDF to your Kindle (enabling conversion). I did that and it looks near perfect. Howev

You can go to the Reader mode on Safari and export as PDF, then email the PDF to your Kindle (enabling conversion). I did that and it looks near perfect. However, you have to do this for each article, which takes some time. Well... not as smooth a process, but the articles are long-ish and worthy of preservation on your Kindle.