Those plugins parse live streams from specific sources. This website searches other websites for on-demand videos and returns links to them wrapped in an HTML5 video player for your convenience.
Jellyfin can handle a live stream (as in, a set of TV channels that it can tune in to) via one of these plugins, but that’s an altogether different process than hooking it up to this website.
I’m not saying it can’t be done, to be clear. It can. It’s just this would need a new plugin for Jellyfin and it’d be substantially more work than those plugins for the reasons I’ve outlined.