Yes I definitely have the correct speed and shifters for MTB (Gevenalle GX 10 speed). I understand the latest Tiagra 4700 for example, has different pull ratios, but I couldn't find any information about the latest T8000 trekking groupset.

Perhaps it is the "Shadow" type? But I thought it was just the way it's mounted and no so much in terms of pull ratio. Unfortunately there is almost no information about this new T8000 rear derailleur since it's so new and niche.

I will see if I can source a rear derailleur alignment tool to double check. But since the derailleur is brand new it's surprising that it came out of the box bent.