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Well, if there's any proof I guess it would have to come from knowing who gave me this advice. I trust very few people to tinker with my vehicle, and he's one of the ones I would trust more than my own self. Over the years he's had quite a few cars (29 y/o now, been racing since he got a license) including a pair of Datsun 280Z's he still has laying around his parents' house. He drives a pretty modified 300zxTT. He does this procedure every oil change - sometimes twice - and his Z is in marvellous condition.
In any case, the ATF is about as viscous as brake fluid if I remember correctly. It's used to help clean out the engine. Gotta figure, you're idling at ~750 RPM for 15 minutes then at 2,000 RPM for 20 seconds. I doubt this does any damage.
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