Podcast articles

The article pages of my podcasts (https://www.doodenverderf.nl/podcast/dood-verderf-juni-2018-madball-obscura-ghost-en-meer/) are very badly indexed by search engines (https://www.google.nl/search?q=site%3Adoodenverderf.nl&oq=site&aqs=chrome.1.69i57j69i59j69i61j69i65j69i61j69i65.1565j0j1&sourceid=chrome&ie=UTF-8). They show up on the very last page of the total index of my site, way later than all the tag pages. It seems that something is wrong there. But what? Is it because the podcast plugin creates a custom article page (and not a normal article)? I would love to benefit from better results in search engines!

The page I need help with: [log in to see the link]