Hi,
(1) I recommend to ask the question in the Workfront forum since it is much more relevant there:
(2) The link you provided include a solution - please elaborate why/if this not fit your needs
Option 1: export the data to csv -> import to the SQL Server using bcp
Option 2: use Workfront API and connect Workfront using externalk application which can also connect the SQL Server (C#, vb.Net or any other language/tech).