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I never got that either. But I was always crap at math. What I can say is your BB height will drop but it won't make much difference while riding along. Unless you switch back & forth between fixed and freewheel bikes like I do, had a few interesting pedal strikes when cornering with the 650b bike.
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Maybe they thought about lower tyre pressure dropping your BB when you sit on the bike?
russmeyer
PepOne
@Sig_Arlecchino
There's one thing in the article on 650blog that I don't understand. If the outer diameter of 650b 38c wheels is the same as a 700c 23c wheel, why do I have to expect the BB to drop by 1cm? Shouldn't it stay at the same height?