The component 'Taerom Makes Additional Ankheg Armor' still has the original game behaviour of any shells being rotted after showing the the first shell to Taerum after a 10 day limit.
From what I've read after you show the first shell to Taerom a time limit of 10 days starts after which any shells will be rotted, even shells from ankhegs you just killed.
During the beginning of the game I got an ankheg shell made into armor, after picking up this armor I got another fresh shell from an ankheg but Tearom tells me it is rotted, I would assume this component is supposed to remove the above time limit otherwise there is not much point.