Actually they did germinate. I actually came across the old proboards last year that Rob himself started. I messaged him on facebook, he or someone who works for him replied. This is the exact reply from June 20, 2016.
"We germinated but very few in the lab. It was a successful cross, but with very low viability. I just checked and there are currently three jars in the lab. That means probably earliest towards the end of next year unfortunately before it's available."