Follow-up: My Dell tech contact confirmed those are internal code names which were used for 2 models sharing the same BIOS.  The latest BIOS v1.13.0 listed on the support site is suitable for the Inspiron 5400 AIO. A request to correct the "applies to" will be submitted. And FWIW, if you look at "applies to" for the Intel chipset driver offered for the Inspiron 5400 AIO, it's "strange", in a different way.  Hopefully they'll fix both of those at same time.
Hi There Everyone! Can anyone tell me what "ICEMAN" and "COLOSSUS" mean in the "applies to" section of the BIOS update information please? I am trying to tell if a BIOS update is applicable to my machine (24 5400 AIO).  An email from Dell says it is but support assist doesn't find it.  I can only see it when I search for updates for my machine manually. Thanks for your help.
BIOS UPDATE INFORMATION