Oh, there are multiple holovid records available - signals technician Giigrushikaad "Bud" Murashuushirar had set up a nice little operation. You see, Archduke Dulinor hadn't been at Capital for a while, and the Imperial Insider network made Bud an offer he couldn't refuse for a holovid of the event. Yes, the Ministry of Information routinely makes exerpts of the daily logs available, but the trashvid services like to get shots of the young noblewomen in their audience gowns...
So of course, Bud was expecting to get a nice patriotic scene fed into his crystals, and instead got the story of the century. In a week copies of the whole event were all over Capital, in six months you could get them on Terra and Regina.
Digital variants started popping up after a year or so. The first ones took a while to get the security encryption just right, and were used by different factions to 'cast blame' - from the pro-Dulinor "Lucan did it and framed the Archduke", the pro-Margaret "she tried to warn his highness but was knocked down by the treacherous guardsman", all the way to the paranoid "everyone but Lucan pulling the trigger" and the macabre 'gag' versions where the customer can place themselves digitally in the scene.
So you can have almost any holovid version you want.