I had the same advice and I thought it stange that when I dumped the black water there didn't seem to be much - especially based on what I had experienced before. Now I know if there is not a gush of water when you pull the black water drain, something is amiss!
I'm pretty sure I found that advice on this forum, but I know my dealer made a point of the order of dumping when we went through the delivery instructions. We also gained insight (here and at the dealer) on NOT leaving the drains open when parked at a site with full hookups - but to dump occasionally to better create flow to clean out the sewer hoses.
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