Hi @VijaySi
The guide is indeed old, but concept is still the same. The integrations works by passing data points from Demandbase to profile parameters in Target.
It seems that in the old guide Demandbase have created a script that passes the data points into profile parameters for you. They name it the Polling script (but link to it doesn't work). However, you don't need this for the integration to work, they've just created it to make the mapping to profile parameters easier for you.
As @prads pointed out you can use most of the guide for the integration with Adobe Analytics - from step 5 https://support.demandbase.com/hc/en-us/articles/8168854269851-Set-Up-the-Demandbase-Adobe-Analytics... instead of mapping to eVars you should use the Adobe Target Extension and map the Data Elements to profile parameters. That should do the trick for you.
Hope this helps!