Not sure if this is a bug/known etc. In the first Alent boss Hydra, the enemy Hot Head is instead called SUDNDEATH (one of the moves another enemy in the same boss performs). I don't think there's anything else up with this boss.
I wasn't scared when I kept seeing sudndeath appearing honest
If I might post my own experience/method - I used bash (on Windows Subsystem for Linux, but the experience should be the same on *nix platforms) for the patching process which some people may prefer. You may need to install the bchunk and xdelta3 packages.
I got the original discs from The Eye...