That feed is incorrectly embedding YouTube videos. In the feed content they use tags like:
[iframe width="320" height="320" frameborder="0" src="https://www.youtube.com/watch?v=pi846_OMVRA">[/iframe>

which embeds the entire YouTube video page (including comments etc) and makes the browser to autoplay the video.

Instead, they should be using proper embed URL which for that particular video would be:
[iframe frameborder="0" src="https://www.youtube.com/embed/pi846_OMVRA">[/iframe>

Note. html tags modified slightly (< to [) to make them visible here.