The intent of the author for this list was "10 most practical, in-demand certifications. Thats why I think these are the best; these are the skills clients repeatedly demonstrate they need most".
As much as I agree with your point that databases are very valuable to a company - I don't see that may RFPs or job applications asking for oracle/MS certified dBAs as much as say CCNAs or MCITP or PMPs or Scrum Masters. I see this list not so much as skill driven but more market driven.
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