Sure it does. If I put more wood on a stove, it gets hotter. Of course, within limits until it uses more than the available oxygen or melts . . .
That's what I meant. You can regulate the power. The same is true of a cold fusion reaction. We do not know how to regulate it (control it) but from a given mass of fuel, it sometimes produces a lot of power, sometimes none at all, and sometimes it varies. It is like burning wet greenwood. It is hard to ignite and the fire flares up and dies down uncontrollably.
I did not mean that the total available energy varies.
Anyway, the metal (ZrO2NiPd in this case) is not the fuel. It is the catalyst. The power will depend on how much of the catalyst is active, and that is complicated. It may not be directly proportional to the mass of metal.