Depends on your definition of "step". If you're thinking in terms of actual weight changes, then you've got a point. The man has two weight changes while the lady has four.
But if you think of the word "step" as simply a part of a process, then it can be any type of action, weight change or not. For example, I'm following the instructions on how to program my VCR. Step 1 says "Press the power button on your VCR". Pressing a button doesn't involve a weight change, but it is a step nonetheless, albeit by a completely different definition of the word.
Interestingly enough, it turns out that the ISTD views the word "step" as having the latter definition, because if you read the Ballroom Technique book, you'll see that they list a total of 3 steps for the man's part of Double Reverse Spin -- the third step being the man's toe pivot, which doesn't involve a weight change.
Another fine example of the ambiguity of our language.
Regards,
Jonathan