I explain the situation to them.
Playing with Choson I could see that the store technologies (armor, shields and attack) are cheaper.
I checked the tech tree and it doesn’t say anything about this, as it was an addition of some update, but the information was not updated in the tech tree.
Likewise, the information of the technological tree shows the reduced cost of units for those civilizations with bonuses and others not, it simply shows normal cost. The same happens with HP or attack.
A quick example: We can see the corrected hitpoints for the Egyptian chariots with bonus on the tech tree, while we can’t see the corrected hitpoints for the Choson swordsman line. We only see the normal stats of this unit.