The UI looks great! Unfortunately, I can't see anything 😕 I've tried all the relays in your demo video and I keep getting the error message "No results found. Try another relay?" 
Discussion
The default relays should show a bunch of videos. Try to reset the default relays. Then reload the page or switch between Home / Shorts - sometimes the videos are not loaded at first.
only loaded my profile from extension, but otherwise nothing loads anywhere on any relay.. looks like it's not firing the REQs, looking at the network tab, it makes an open req: ["REQ","...",{"kinds":[1984]}] to ditto and then received a ["CLOSED","...","error: the relay could not respond fast enough"]
OK,.. the timeouts I have set, are probably too low then.