In that case, the Hollowgram name is basically branding rather than an indication that it's hollow.
Well, before the Si forged crank they all were hollow...
I reckon that's just a bug in teh internetz; the data sheets I've seen refer to the Si forged crank as Cannondale Si
Still a good product as it takes the same hardware as the Hollowgram cranks, spidey, OPI and whatnot. Great for MTBs.
@Howard started
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In that case, the Hollowgram name is basically branding rather than an indication that it's hollow.