Thanks for the clarification.
I don't feel you need to remove any terminology, just fix the UFOpaedia text in the screenshot to say "Building it requires: 150 Alien Alloys".
Over the course of my whole game that screenshot was the only use of the term that really confused me. I actually went and tried to find "Tritanium" in the UFOpaedia, thinking maybe it's some kind of new, distinct component. It's a bit unfair that page uses a term that's different from the actual component. I recognize you want to maintain the "engineering" feel of the text, but since it's a footnote anyway is it really that important to use "Tritanium" in the context of the help page?
"Alien Alloys" is an actual item you can find in UFOpaedia, and in your inventory lists in the game. "Tritanium" is not. In my own view this makes the occurrence in that UFOpaedia page a no-brainer typographic error, regardless of the intended interpretation of the words. (I wouldn't care so much if the page was just lore).
Cheers!