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This was good while it worked, but Ubisoft added a new function to the game where if you are connected to Ubisoft Connect it will verify if you should have certain Helix items or not. 
From the patch notes: Added date of purchase to items listed in the owned section of the store.

And from the other cheat engine site: Load your pre-update save or any save where you have the items in offline mode. You should still have them, but it is very finicky.