I always considered this six question format to be the Baseline Agile Retrospective Format. I say baseline instead of standard because a baseline is something to build on, not an ‘always the way’ standard (I know I’m splitting hairs here).
I believe the six question baseline agile retrospective format is a solid way to teach people how to do an agile retrospective. They can see, relatively clearly, the different parts that should be included. It can be a useful starting point to address additional questions and challenges.