I have to admit that I have currently no idea what the maximum temperature inside the Lugano reactor would have been.
It depends on the temperatures and we don't know if the reported ones are correct.
An option is to use the data Para supplied to you and make up your own estimate
All this for that therefore thanks to your work. My own estimation is nickel particles couln't be melted and AR uses a trick to do a large amount of H monoatomic ( as said Focardi) as Japanese researchers done by adding a few Pd atoms onto Ni particles ( spillover effect).