Not as simple as that.<quoted text>
Other words you are trying hard to ignore that 2+2=4 no matter who did the adding.
Statistics deal in probability, not certainty.
And the validity of the result depends on the validity of your assumptions.
Make the wrong assumptions and you can conclude that 2+2 probably = 5, or 2+2 almost certainly != 4.
Which is what the authors of this study, not knowing anything about physics or climate science, have done.
And no, the rest of the scientific community has not looked at it yet. When they do, the paper is going to fall over pretty quickly.
If it's as bad as some of the denialist crap that's made it into a journal before, it will be a resigning issue.