That page is wrong...I'm not sure why that still comes up.
The true coppers I own are 100% copper. There is not a stick of aluminum anywhere on these :
(I cut my 3rd one open just to prove it.)
I'm not sure what thermalright sold under that true copper brand......The 3 I bought came in the pearl white boxes....there were only 1000 made or something. They are true copper.
I've dissipated 500 watts thru one of these with shitty fans.