If you insist that the damage is due to heat, why would it be a death ray for bird-sized animals? Their skin is nearly as effective at temperature dispersion as human skin, and that article didn't indicate, nor do believe that temperatures on "heat spots" get so high as to cause outright lethal damage.
I never said radar's were not dangerous if you sat in front of one all day, but I still don't think you've made a good case for a bird perched in front of one to have been "cooked," as you said. I suppose you were using hyperbole...