I think it's all client side javascript rendering, which doesn't play well with social media previews. It probably also doesn't have a database, so nowhere to store short url to long url mapping.

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I do use njump.me to share posts all the time and get previews everywhere, even telegram instant views which are pretty good, so it must have at least some server side rendering

what do you mean? I can read the event content in your screenshot

Yes but not the images.

well, my point was that it has server-side rendering, I don't know about the images

Indeed, if it already renders server side then it just needs to add images.