> building highly scalable distributed system

I doubt that. Looking through the link and recently having discussed this in an OT-thread of an hobbyist-forum, the only thing you learn is AWS-lego. I don't see, how training for marketing keyword-riddled multiple choice-questions helps you in understanding the systems in question (case in point: Q1 of the "blog" - basically the only skill required is basic (!) logic matching requirements to the services (my mother can do this) and translating the marketing speech to requirements... – you don't need to know anything about interdependencies.)