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I wondered about this also. Is the 90 degree the vertical? Personally I'm not sure, but to not mention the vertical push up was not a dis on my part. Every time I speak with Warren Tetting he tells me I should be doing these, vertical push ups. : ]You mean THE 90 degree push-up? As in "Handstand drop into bent arm planche, then press back into Handstand"?
From the fact that no one else seems to have made much notice of your choice, I'll go ahead and guess you're referring to something else. Otherwise, hat's off to you sir as that's a tremendously difficult exercise that I've been working towards for many months now. Hard for me to think of any other kind of press that requires as much sheer tension, coordination and multiplanar pushing strength as the 90 degree PU.