I have the skull of torture on one of my SKs.
And that was 2016 or 2017 when I did it.
A Glowing Skull dropped off one of the three listed npcs.
Had a bard friend hand in A Glowing Skull to the A skeletal cook.
That part is working..
I believe what OP is referring to is the optional / alternative way to obtain A Glowing Skull.
If the section on the wiki -> "Building the Glowing Skull by yourself"
https://wiki.project1999.com/Mirgon_Dower%27s_Head
I can't confirm if this is working.