I think there’s some confusion here. The original post was referring to the similarity of temperatures (allowing for distance from the sun) of the two atmospheres at the same pressures, not at the planets’ surfaces. 1000 millibars is the pressure at the surface of the Earth, but that pressure exists in Venus’s atmosphere at 50-65 km above the surface. The temperature at that altitude is what is being compared to the temperature of the atmosphere at Earth’s surface, not the temperature at Venus’s surface.
Well. if the guy cannot write clearly then what’s the use?
Further. it’s a bogus comparison in the first place - comparing dissimilar things and then equating them is idiotic. To go on to make a statement deriving from that guy’s bogus equating, is exactly what the man-made climate disruptioners do. So the math and the conclusions are pure made up BS - the guy cannot even keep Kelvin and Celsius straight.
One could make a “mathematical” case that the moon is really made of green cheese by comparing the height of the average lunar surface feature to the height of the cheese counter in the grocery store, the placement of the green cheese on windy days right after a full moon ... and so on ...