I think it’s ‘possible’ to do this in Webflow…pun intended
Most (if not all) of the Webflow marketing/education sites I believe are ‘Made in Webflow’
Looking at it without delving deep into code, it looks like the videos are a Youtube embed for each page, and the playlisting order will be set in Youtube.
Next to the Youtube embed i’m guessing is a custom built menu linking to each video’s page - if I had some spare time I would try and recreate!
Adding &autoplay=1 at the end of the Youtube ID should work, see here for embedding a playlist (adding to the end of the playlist URL works):
Just to note, that would start the video as soon as the page loads (also plays in the designer) not always desired behaviour - will the user expect it?
An alternative would be to add the URL into a lightbox, so it only starts playing (in the lightbox) when a user clicks to do so…