There are no quick fixes. There is no simple approach that is possible to understand and learn in a 'crash course'. As with any human approach that has evolved over centuries design is not something that you can 'use'. It is obvious to most people that a 90-minute 'crash course' in the scientific methodology is not going to make it possible to conduct any form of advanced or even useful science. "Crash courses' may have their place and a role to play, but it is a way that will make it possible to "take away some of the basic principles of Design Thinking and start to adapt them into your personal and professional routines".
Design thinking can of course be learned. But it takes time, training and practice. And instead of 'learning' a stepwise methodology, a 'crash course' may be a way to introduce the foundational ideas behind design as an approach in a way that makes it possible to understand what it is, how it differs from other approaches and what it takes to actually perform design thinking. However, this requires maybe a bit more by those who offer these courses than what is the case today.