Extended Events to find Blocking and Deadlocking
Glad you liked the post - it was by Jeremiah Peschka though, not me. (I know because I use it all the time myself!)

Make sure to read the entire article, though, which includes the answer you seek:


  Extended Events deadlock graphs use a slightly different XML schema
  than what SSMS expects. You should see an error along the lines of
  “There is an error in XML document”. For folks using SQL Server 2012
  and earlier, you can either parse the XML by hand or use SQL Sentry
  Plan Explorer.