Roll up Post on Parent entity

I need to create a workflow that clones the post on a Contact record to it's parent Account record. 

I thought of doing this by checking the Regarding(Contact) if not null and if CompanyName:Regarding(Contact) is not null then I would create a Post for the Regarding(Contact) parent account's record. 

The problem is that I can't find a way to check on the Post Regarding record type: 

Is there a workaround to achieve this requirement ?