I was thinking the opposite (too!). I thought he meant something like Nicozeg's ringed baseplate, but with radial fins cut into it.
It's like the pyramid block. The problem is that it effectively creates a thick baseplate, which causes an increased temperature gradient. Also, the inpingement effect is completely nullified, because the flow essentially gets redirected over the surface of the "baseplate", wether it be flat or cone shaped.
The inpingement effect throws water in high turbulence, as a result of "slamming" the water against the bp. This turbulence is what makes the heat transfer more efficient.
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