Problem with Xilinx SDK - Failed to Scan JTAG Chain
That tutorial is for a different board.

In particular, it appears from the Trenz docs that their board is emulating a Digilent JTAG cable, not a Xilinx one.  

I'm not sure that is automatically recognized by the "Auto Detect" option shown in Fig38 of the tutorial you are using - or even whether it is supported by Vivado at all... 

I would suggest you try following the Trenz JTAG doc linked to above and check that you can successfully scan the chain with Impact first.