The broadcasts on Hardcore Worlds announce world firsts and the deaths of players past a progression threshold. The very first one was a death: M Hardcorpse died nine seconds after leaving Tutorial Island, which Old School RuneScape’s account on X confirmed after Jagex’s Anti-Cheat and Data teams verified it. The OSRS Wiki’s Hardcore Worlds page records it as the first death on the mode.
The name is in use again: on 7 November the hiscores show M Hardcorpse at total level 258 with no death record, which is what a Reset looks like, a fresh start under the same name. It is the most honest statistic a one-life mode can produce: the fastest way to the Reaper is to play as if you had respawns.