Many of the planes, especially the new ones, have massive nose up tendencies that you have to fight.
For the Camel 130, I watched the plane in exterior view and it's the elevator that's the problem. In the 110 or 150, you pull back or push forward on the stick and release and the elevator returns to neutral (0 degrees deflection).
On the 130, If you pull back and release, it returns to what seems to be 5 or so degrees up. If you push forward and release, it returns to about 5 degrees down. It won't return to 0 degrees. That trim statement may fix it, but I don't know if that's a line missing from it that the 110 and 150 have or if it's merely a band-aid to fix the real problem somewhere else.