Recently I have tried to find weapons and armor via tauhead.com but later I found out all info is outdated.
Is there a way to update it or remove from recommended resources?
The Tau Tracker has up to date item information at https://tracker.tauguide.de/item
It is not as fancy as tauhead, but maintained.
You too can contribute to the tracker data, see https://github.com/taustation-fan/universal-tau-tracker#setup