810 is (from memory) Alumina and Magnesium Oxide with a trace of Zinc Oxide.
Lugano reactor core was not done with that cement but with pure Alumina.
This was verified by X-Ray diffraction.
The IR camera emissivity setting has nothing to do with total emissivity.
FALSE. This is pure disinformation.
Also.
In the Lugano paper itself is demonstrated that Allumina pipes have an emissivity much lower then the BB.
In that case it was possible for the group of scientists to measure the actual emissivity using reference dots.
The value obtained was compatible with the value of the total emissivity found in literature for pure Alumina the temperature of the pipes.
There was at least another version around.
The version you are linking looks well printed..... but completely ill based.
You can't do a calculus like TC (? is the real author ) propose.
First all the argument of the band emissivity is wrong ( Paradigmoia I have tried to explain that to you many times )
Second even if you would like to do so you would have to consider the actual band sensitivity of the camera vs wave length (i.e. light "color" in IR band ), that is not a flat ( constant ) function and depends on optics and sensor ( in fact each pixel is different ).
I really think that diffusing this kind of false information could be against law in that case because of the ongoing trial, and I presume that any scientist who may have read that paper had thrown it in the bin in just few seconds.