It can only make it reach that temperature slower or faster
The calorimeter measures a time averaged and location averaged temperature over the whole reactor
The dynamics of the instantaneous temperature on the interior and exterior wall can be affected by the hydrogen gas
on the interior..
I think Wyttenbach may be seeing a connection btw the dynamics of the temperature change and the low EV gamma emissions in the
(which is related to the fundamental mechanism.)
However replication of Mizuno's averaged calorimetry will not yield much info. about the fundamental mechanism..