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I'm not a plant scientist or a physicist - but don't these findings overlap pretty precisely by the spectrum chart of visible, infrared, and near-UV light that is emitted by hot objects? Ie: black body radiation curves?
Its not novel to note that animals (broadly) emit heat when alive. Damaged plants also show higher temps due to sap/fluid flowing to the damaged area and then being unable to regulate their temp as usual, so under the same light conditions - a damaged plant next to an undamaged plant will show more heat radiation along the areas of damage, as well as some added heat in areas of high water content on both plants - which seems to be what the images show?
I don't have full access to the study, but the summary doesn't mention black body radiation curves at all, and you'd think it would if they'd discounted it? Sure black body curves go very high, but this study has used very sensitive cameras to detect 'single photons' so if there is any heat radiation, they'd pick it up.
