>This would mean it puts out 500,000watt-meter^2 or about 50 times the heat of the surface of the sun

Where are you getting this figure? A random website[1] says the heat on the surface of the sun is 62,499,432 W/m^2.

Also the die sizes are on page 2: 198.4 mm^2 for the 10 core part. Divide the total power (254W) by that and you get 1,280,236 W/m^2.

[1] https://www.pveducation.org/pvcdrom/properties-of-sunlight/t...