Wow. This guy has all the hallmarks of a self-proclaimed guru. Spouting psuedoscience while giving a bunch of excuses for why his psuedoscience is valid in case any detractors come for him.
From there:
> I am no guru, but when .guru domains became available, my colleagues suggested that only I could own that domain. We bought supermemo.guru in February 2014, and I accepted the position of the guru on the understanding that the world of SuperMemo is so specialist that it may indeed be hard to find a better SuperMemo Guru.