The work was done to list out all the tech beneath the Meinwerk Palace for HRE. It’s basically a copy and paste of what’s under the Blacksmith.
These tooltips should reflect the -25% discount the Meinwerk Palace offers.
EDIT: I think this is a global issue across all civs. Another example is the cost of emplacements for HRE on Outposts and Keeps is reduced by 25% - yet the prices for the emplacement upgrades under Outposts is the same across the board for HRE and every civ in the tech tree. Springald Emplacement: 50 gold, 125 stone